Exhibit 99.1 EXECUTION VERSION AMENDED AND RESTATED GUARANTY AGREEMENT THIS AMENDED AND RESTATED GUARANTY AGREEMENT (this "Guaranty") is made effective as of the 16th day of March, 2008, by JPMORGAN CHASE & CO. (the "Guarantor"), a Delaware...Guaranty Agreement • March 31st, 2008 • IndyMac IMSC Mortgage Loan Trust 2007-Ar2 • Asset-backed securities • New York
