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All procedures were approved by the Ethics Committee of the Russian Academy of Sciences. Iimmunohistochemical testing using the Cytokeratin pan (DAKO, cat. N MO82101) and Ki-67 (DAKO, cat. N IS626) antibodies was carried out according to the standard procedure (M��hlhauser et al., 1993). To estimate glycogen localisation, the standard PAS-reaction with diastase control was used (Sheedah and Hrapchak, 1987). To determine cytophotometrically [http://www.selleckchem.com/products/CP-690550.html find more] the DNA content, the Feulgen reaction on the squash preparation was carried out as previously described (Zybina et al., 2005). Slides were examined with an Axiovert 200M microscope with objective lenses 10��/0.30, 20��/0.50, 40��/0.75. The photos were taken with a colour CCD camera Leica DFC 420, format 2592?��?1944. The images were acquired using Photoshop CS2. Mitotic index was estimated as percentage of mitoses in each cell population. Two hundred cells of each subpopulation were analysed from five foetuses at each stage of gestation. DNA content measurement and ploidy estimation was carried out using a ��Videotest�� image analyser composed of the 83 60 digital CCD-videocamera [http://www.selleckchem.com/products/XL184.html VEGFR inhibitor] (Chipper, USA) installed on an EC Bimam-13 microscope and of computer IBM PC 166 as before (Zybina et al., 2005). In each placenta, these were analysed from 150 to 400 trophoblast cell nuclei of each subpopulation and 50 nuclei of foetal erythrocytes as a control of the DNA content per diploid nucleus. Statistical significance [https://en.wikipedia.org/wiki/Tuclazepam tuclazepam] of difference in percentage of various ploidy classes between different cell subpopulations at different developmental stages was assessed using the ��2-test (P?