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Expression levels of male germ cell‐specific markers of hUC ‐MSCs induced by different concentrations of BMP4. (a) Under induction of 12.5 ng/ml BMP4, expression levels of STRA8 and PLZF increased significantly, as determined by qRT‐PCR analysis. (b) Shrinking SSEA‐1+ cells were highly positive for VASA, as demonstrated by immunofluorescence staining.
