on the basis of these findings the authors propose the existence of helper t cells which are characterized by peripheralization in early periods of ontogeny , the possession of helper activity for only igm-antibody responses , the lack of helper activity for the switch from igm- to igg-antibody responses and relative insusceptibility to the cytotoxic effect of anti-thymus cell serum and complement .
C0229671
serum
C0009498
complement