Fig. 3From: Human umbilical cord mesenchymal stem cells improve the reserve function of perimenopausal ovary via a paracrine mechanismH&E staining analysis of ovarian structures. a Control group. b Treatment group at 14 days after hUCMSCs transplantation. c Treatment group at 21 days after hUCMSCs transplantation. d Treatment group at 28 days after hUCMSCs transplantation. e Normal control group. Scale bar = 500 umBack to article page