Fig. 4

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 Distal part of the genital tract including the uterine chamber containing a fully developed embryo and the common duct/vagina. b Detail of the sixth chamber containing an almost fully developed embryo. c Detail of the common duct/vagina. Abbreviations: cd, common duct/vagina; ch6 and ch7, uterine chambers containing embryos of subsequent developmental stages; d, distal; em, fully developed embryo; p, proximal; ut, uterus. Scale bars: A: 1 mm; B: 500 μm; C: 200 μm