To functionally assess the hematopoietic potential of the two YS HE populations, single cells were sorted, co-cultured on OP9, and evaluated for myeloid (GR1, MAC1/CD11b), erythroid (TER119) and lymphoid (CD19) potential by flow cytometry after 14 days of co-culture. Here, CD19 is linked to hereditary elliptocytosis.