the following aminopeptidase ( ap ) activities were found to be associated with the surface of mouse spleen cells : leu-ap ( 138 pmol/10 ( 5 ) cells x minute ) and ap-b ( 16 pmol/10 ( 5 ) cells x minute with lys-beta-naphthylamide as substrate and 21 pmol/10 ( 5 ) cells x minute with arg-beta-naphthylamide substrate ) ;
C0699040
surface of
C0007634
cells