this thymus requirement can be substituted for by a variety of treatments which stimulate thymus-derived ( t ) cell activity in the periphery , such as the rejection of allogeneic skin grafts , immunologic challenge with thymus-dependent immunogens , ( e.g. , heterologous erythrocytes ) , or plant-derived lectins ( e.g. , concanavalin a ) .
C0304052
plant
C0009630
concanavalin