the gamma subunit of the human t lymphocyte t3 antigen is rapidly phosphorylated on serine residues in vivo during the initiation of t cell activation by a polyclonal mitogen ( phaseolus vulgaris phytohemagglutinin ) , an activator of protein kinase c ( phorbol 12,13-dibutyrate ) , and an elevator of intracellular calcium ( ionomycin ) .
C0039194
t lymphocyte
C1155065
t cell activation