it is not possible to determine from the data whether stimulation of precursor cells with gammag or gammaa receptors requires concommitant stimulation of separate cells with only gammam receptors , or whether cells bearing gammam receptors are precommitted to or differentiate into cells capable of synthesis of other ig classes , or whether receptors of gammam and another ig class are present on some virgin precursors or the second ig receptor appears after antigenic stimulation .
C0018956
precursor cells
C0007634
cells