two synergizing antigen-specific helper t ( th ) cell populations are required for an optimal tepc15 ( t15 ) -dominated antiphosphorylcholine ( pc ) plaque- forming cell response . in these studies , the two th cell sets are shown to differ in their requirements for recognition of self-major histocompatibility complex ( mhc ) -encoded determinants by testing the ability of th cells from f ( 1 ) { arrow } parent bone marrow chimeras to collaborate with pc-specific b cells bearing mhc-encoded determinants of either parental haplotypes .
C0011389
plaque
C0016327
f