gestational hematopoietic stem cell fetal liver hematopoietic progenitor cell A hematopoietic stem cell that resides in the fetal liver. In mice, this cell type is first observed at E10.5. This cell type is MHC-positive, HSA-positive, AA4.1-positive, CD45-positive, Sca-1 positive, CD150-positive, CD48-negative and CD244-negative. Jie Zheng Tomasz Adamusiak cell type