csa levels in normal human sera were greatly reduced by assay in the absence of adequate numbers of bone marrow `` '' adherent cells '' '' ( cells adherent to nylon or plastic ) or peripheral blood leucocytes , suggesting the presence of two kinds of csa in human serum , one dependent on the presence of bone marrow adherent cells and one effective in their absence .
C0229664
r peripheral blo
C0023516
leucocyt