peritoneal cells obtained from mice immunized 15 or 30 days previously with ( i ) 0.1 ld ( 50 ) of attenuated salmonella typhimurium ( ria ) , ( ii ) 20 mug ( dry weight ) of heat-killed salmonella ( sr-11 ) , ( iii ) 20 mug ( dry weight ) of immunogenic ribosomal subfractions , or ( iv ) 20 mug of ribonucleic acid ( rna ) subfractions were passively transferred to normal unimmunized mice .
C0007634
cells
C0035553
ribosomal