the results were deemed to be consistent with the conclusions derived in the previous paper of this series , namely that thymus contains some , but a small number only of antigen-reactive cells ( arc ) , bone marrow contains antibody-forming cell precursors ( afcp ) but no arc , and thoracic duct lymph contains both arc and afcp with a probable predominance of the former .
C0007634
arc
C0018956
afcp