abnormalities cancer cancercells celldifferentiation cellfusion cellnucleus cellphysiologicalphenomena cellularcontrolmechanisms cellularreprogrammingtechniques congresses cytopathology cytoplasm eukaryota evolution germcells inducedpluripotentstemcells laboratorymethods methods microscopy molecularbiology morphology pathology physiology protozoa qh573-671 qh595m7181975 qu350 qu350n9652006 qx50r151i1982a transplantation ultrastructure