while cm or pm from unstimulated t lymphocytes failed to stimulate bfu-e proliferation , activation of t cells by either phytohemagglutinin-m ( 1 % ) or concanavalin a ( con a ; 5 micrograms/ml ) induced the expression of a factor on the pm and in the resultant cm that stimulated the formation of erythroid bursts .
C0039194
t lymphocytes
C1155065
activation