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Analysis for Antigenic Similarities Among the 30S Ribosomal Proteins of Escherichia coli¹

^a Department of Microbiology, University of Illinois, Urbana, Illinois 61801

ABSTRACT

Antiserum was made against a single 30S protein, 30S-7. The amount of complement fixed by total 30S protein in the presence of this antiserum indicated that protein 30S-7 was the major antigen in the mixture of proteins. Each of the 30S ribosomal proteins was tested for cross-reactivity with anti-30S-7. This was done by determining if any of the other 30S proteins inhibited complement fixation by 30S-7. None of the other 30S proteins was found to inhibit complement fixation by 30S-7, indicating that 30S-7 is antigenically distinct from the other proteins.

² Present address: Biology Laboratories, Oak Ridge National Laboratories, Oak Ridge, Tenn. 37830.

³ Present address: College of Medicine, University of California, Irvine, Calif. 92664.

¹ Taken from a thesis submitted by B.C.S. to the Graduate College, University of Illinois, in partial fulfillment of the requirements for the Ph.D. degree.