to investigate the mechanisms behind this apparently differential inhibition of lymphokine production , we stimulated pbmc from recipients of hla-identical sibling bone marrow transplants with phytohaemagglutinin ( pha ) , pha + phorbol ester ( pma ) ( to bypass accessory cell requirements ) or ca++ ionophore + pma ( to bypass both accessory cell and t cell surface receptor ( cd2 and/or cd3/ti interactions ) .
C0031586
phorbol ester
C0039654
pma