Fig. 6

Apoptosis in the genital tract of the placentotrophic peripatid gen. sp. 2. Nuclei of TUNEL-positive cells are marked in orange, nuclei stained with DAPI are represented in gray. Proximal is up in all images. a Distal part of the genital tract, including the chamber with an almost fully developed embryo, as well as the common duct or vagina. b Detail of the uterus portion connecting the sixth and seventh chambers. Note the apoptotic cells in repeated regions of condensed tissue (dotted ovals). 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; dz, distal degeneration zone; em, fully developed embryo; p, proximal; ut, uterus. Scale bars: A: 1 mm; B, C: 200 μm