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Comparison of STO and hUC-MSCs as feeder cells. (a) Morphological overview showed that OSCs cultured on the hUC-MSCs represented nest-like colonies (left), as compared to the typical cluster-like structures on STO (right). (b) RT-PCR analysis for gene expression profiles of OSCs cultured on STO and hUC-MSCs. The results displayed that, compared to STO feeder, OSCs on hUC-MSCs still retained the germ cell markers. STO and MSC, the negative controls for RT-PCR.
