mGS–derived cells express HOXB4, but not CDX4 or CXCR4. RT-PCR for CDX4 and HOXB4 among various hematopoitic cells (A). KSL = c-kit+Sca-1+lineage– cells, BM lin– = bone marrow lineage-negative cells, FO6 = Flk1 culture on OP9 day 6, FO8 = Flk1 culture on OP9 day 8. Relative HOXB4 expression in the various hematopoitic cells (B). With AGM as a reference, the relative expressions of HOXB4 in each sample were follows; 16.5FL 0.02, BM lin– 0.09, BM KSL 0.43, mGS FO6 0.74, CCE FO6 0.15. c-kit, Sca-1, and CXCR4 expression on mGS-derived cells [(C) 6 days culture].