The expression of genes in co-cultured CD34+ cells and feeder after 1 week. The results demonstrated that the expression of the HOXA9, HOXB2, HOXB4, BMI1, HOXC4, GATA-1, HIF-1α, and C-MYB genes was significantly higher in the hypoxia testosterone group compared with all other groups. Data are presented as the mean + standard deviation. *P<0.05 and **P<0.01. HOX, homeobox; HIF-1α, hypoxia inducible factor α.