secondly , limiting dilution experiments , in which several graded and limiting inocula of marrow cells were mixed with a non-limiting number of 10 ( 8 ) thymocytes and injected into irradiated , syngeneic recipients , indicated that the low responsiveness of the sjl and dba/1 strains to the ( phe , g ) and pro -- l specificities , respectively , could be attributed to a reduced number of precursor cells found in bone marrow .
C0007634
cells
C0018956
precursor cells