thymus and ln derived cfc differed from bone marrow derived cfu-c in several characteristics parameters : ( 1 ) sole specificity of pmue to induce colony formation ( cf ) , ( 2 ) apparent singular line of monocyte-macrophage differentiation , ( 3 ) a marked 6- to 10-day lag period prior to initiation of cf , and ( 4 ) significantly slower rates of appearance of colonies in culture after initiation of cf .
C0007634
cfc
C0080129
period