1 EXHIBIT 4.3 RIBOGENE, INC. TENTH AMENDED AND RESTATED RIGHTS AGREEMENT 2 TABLE OF CONTENTSRights Agreement • April 8th, 1998 • Ribogene Inc / Ca/ • Services-commercial physical & biological research • California
RECITALSResearch Agreement • April 8th, 1998 • Ribogene Inc / Ca/ • Services-commercial physical & biological research • California
AMENDMENT TO UNIT PURCHASE OPTIONUnit Purchase Option • April 8th, 1998 • Ribogene Inc / Ca/ • Services-commercial physical & biological research
1 EXHIBIT 10.33 December 31, 1997 Hyline Laboratories, Inc. c/o Salon, Marrow & Dyckman, LLP 685 Third Avenue New York, NY 10017 Attn: Joel Salon Mr. Michael Ashkin c/o Salon, Marrow & Dyckman, LLP 685 Third Avenue New York, NY 10017 Attn: Joel Salon...Ribogene Inc / Ca/ • April 8th, 1998 • Services-commercial physical & biological research
1 EXHIBIT 4.21 THE SECURITIES EVIDENCED BY THIS CERTIFICATE HAVE BEEN ACQUIRED FOR INVESTMENT AND HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933. SUCH SECURITIES MAY NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR AN...Ribogene Inc / Ca/ • April 8th, 1998 • Services-commercial physical & biological research
