scientific article
['Retraction for Shen et al: Oocyte-like cells can be differentiated from mouse embryonic stem cells induced by the stage-specific ovary-conditioned medium and cocultured ovary somatic cells in vitro.', 'scientific article', 'Retraction for Shen et al: Oocyte-like cells can be differentiated from mouse embryonic stem cells induced by the stage-specific ovary-conditioned medium and cocultured ovary somatic cells in vitro.', '2007-09-13']