Kang et al. reported that culture of vitrified-thawed human ovarian tissues supplemented with a relatively low concentration of FGF2 (150 ng/mL) alone for two days and then subcutaneous xenografting to severe combined immune deficiency mice for one week significantly increased microvessel density and the number of follicles, while apoptosis significantly decreased. This evidence concerns the gene FGF2 and Immunodeficiency.