Fig. 4From: UC-MSCs promote frozen-thawed ovaries angiogenesis via activation of the Wnt/β-catenin pathway in vitro ovarian culture systemUC-MSCs increased the microvessels of thawed ovaries in vitro culture system. a Representative images of ovarian microvessels in the four groups using CD31 immunohistological staining. Brown represents positive staining vessels. Scale bar = 100 µm. b The microvascular density was quantified. Bar represents mean ± SD, n = 5 (biological replicates); **P < 0.01 and ***P < 0.001Back to article page