the tdt-positive thymocytes are depleted by cortisone administration , lack responsiveness to phytohemagglutinin , concanavalin-a , and histocompatibility alloantigens , bear surface antigens characteristic of cortical thymocytes ( bone marrow lymphocyte antigen ) and lack surface antigens characteristic of medullary thymocytes ( rat-masked thymocyte antigen and histocompatibility antigens ) .
C0003339
surface antigens
C0019628
histocompatibility antigens