Fig. 3From: Evidence for cell turnover as the mechanism responsible for the transport of embryos towards the vagina in viviparous onychophorans (velvet worms)Cell proliferation in the genital tract of the placentotrophic peripatid gen. sp. 2. Nuclei stained with DAPI are represented in gray, condensing DNA and chromosomes of dividing cells (α-PH3 labeling) in orange. Proximal is up in all images. a Proximal part of the genital tract including the ovary and the first two uterine chambers containing early embryos. b Detail of the ovary with seminal receptacles and ovarian funnels. Note that the signal in the ovaries is restricted to the germinal epithelium. c Detail of the first chamber with an implantation zone. d Third to fifth chambers containing a morula and early segmentation stage embryos. Abbreviations: ch1–ch5, uterine chambers 1 to 5 with embryos of subsequent developmental stages; d, distal; ge, germinal epithelium; iz, implantation zone; mo, morula; of, ovarian funnel; ov, ovary; p, proximal; pz, proximal proliferation zone; sr, seminal receptacle; ut, uterus. Scale bars: A, D: 500 μm; B, C: 200 μmBack to article page