part of part of lacks_plasma_membrane_part has plasma membrane part gestational hematopoietic stem cell yolk sac hematopoietic stem cell 2010-09-22T09:08:34Z A hematopoietic stem found in the yolk sac. In mice, this cell type is Sca-1-negative, CD45-negative, MHC-negative, HSA-positive, AA4.1-positive, CD44-positive. hemangioblast precursor MHC protein complex receptor-type tyrosine-protein phosphatase C CD44 molecule signal transducer CD24 complement component C1q receptor lymphocyte antigen 6A-2/6E-1 yolk sac