celldetermination celldifferentiation cellline celllines cellmembrane cellmembranes cellularcontrolmechanisms congresses developmentalbiology evolutionarygenetics genetics hematopoiesis hematopoieticstemcells homeoboxgenes insituhybridization microbial microbialdifferentiation microorganisms molecularbiology physiology qh601s677c1979 qh607i63c1979 qw51s1317m1984 qw52s132m1984 research sex(biology) sexdeterminationprocesses situhybridization stemcells