Protocols for isolation and characterization of mouse placental hemogenic endothelial cells

The murine mid-gestational placenta has been identified as a hematopoietic site during embryonic development. Here, we describe a protocol for isolation and characterization of the hemogenic endothelial (HE) cells from mouse placenta. We also describe techniques for dissection of placental tissues and for the optimization of tissue digestion and antibody conjugation conditions to identify HE cells via fluorescence-activated cell sorting. For details on the usage and application of this protocol, please refer to Liang et al. (2021).