Common use of WASHINGTON MUTUAL MORTGAGE SECURITIES CORP Clause in Contracts

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for Washington Mutual MSC Series 2003-AR3] ACKNOWLEDGEMENT OF CORPORATION ACKNOWLEDGEMENT ACKNOWLEDGEMENT Appendix 1 WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class I-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class III-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class IV-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class V-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class I-X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class II-X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class M WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class B-1 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for Washington Mutual MSC WaMu Series 20030000-AR3X0] ACKNOWLEDGEMENT OF CORPORATION XXXXXXXXXXXXXXX ACKNOWLEDGEMENT ACKNOWLEDGEMENT Appendix 1 WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class I-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-2 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class III-A A-3 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class IV-A A-4 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class V-A A-5 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class IA-6 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-7 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-8 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-9 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-10 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-11 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class II-X P WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class M WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class B-1 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for Washington Mutual MSC WaMu Series 20030000-AR3X0] ACKNOWLEDGEMENT OF CORPORATION XXXXXXXXXXXXXXX XX XXXXXXXXXXX ACKNOWLEDGEMENT ACKNOWLEDGEMENT Appendix 1 WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A A-1 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-2 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-3 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class III-A A-4 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class IV-A A-5 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class V-A A-6 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class IA-7 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-8 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-9 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-10 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-11 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class II-X P WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class M WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class B-1 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for Washington Mutual MSC WaMu Series 20030000-AR3X0] ACKNOWLEDGEMENT OF CORPORATION XXXXXXXXXXXXXXX XX XXXXXXXXXXX ACKNOWLEDGEMENT ACKNOWLEDGEMENT Appendix 1 WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Cede & Co.Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class IIICede & Co. Registered Owner WaMu MORTGAGE PASS-A THROUGH CERTIFICATE Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class IVII-A A-11 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class V-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class III-A Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MSC MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class II-X Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class III-X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class M IV-X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-P WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class A-P WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class C-B-1 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for Washington Mutual MSC Series WMMS 2003-AR3AR2] ACKNOWLEDGEMENT OF CORPORATION ACKNOWLEDGEMENT ACKNOWLEDGEMENT Appendix Xxxxxxxx 1 WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class IWASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-A THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class III-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class IV-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class V-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class I-X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class IIWASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co.Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-X THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class M WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class B-1 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.

WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. [Signature page to Pooling and Servicing Agreement for Washington Mutual MSC WaMu Series 20030000-AR3X0] ACKNOWLEDGEMENT OF CORPORATION XXXXXXXXXXXXXXX XX XXXXXXXXXXX ACKNOWLEDGEMENT ACKNOWLEDGEMENT Appendix 1 WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class I-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MSC MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-11 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-13 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-14 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-18 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-19 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-25 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-26 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-27 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-28 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class I-A-29 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class II-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class III-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class IV-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class V-A WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC MORTGAGE PASS-THROUGH CERTIFICATE Class IC-X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class II-X WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class M C-P WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WASHINGTON MUTUAL MSC WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class II-P WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. Cede & Co. Registered Owner WaMu MORTGAGE PASS-THROUGH CERTIFICATE Class C-B-1 WASHINGTON MUTUAL MORTGAGE SECURITIES CORP.