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The evolution of viviparity: molecular and genomic data from squamate reptiles advance understanding of live birth in amniotes. Reproduction<\/i> 2013; 147: R15\u2013R26.","DOI":"10.1530\/REP-13-0309"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. McGowen MR, Erez O, Romero R, Wildman DE. The evolution of embryo implantation. Int J Dev Biol<\/i> 2014; 58: 155\u2013161.","DOI":"10.1387\/ijdb.140020dw"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Enders AC, Carter AM. Comparative placentation: some interesting modifications for histotrophic nutrition -- a review. Placenta<\/i> 2006; 27 (Suppl A): S11\u2013S16.","DOI":"10.1016\/j.placenta.2005.10.013"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Mika K, Whittington CM, McAllan BM, Lynch VJ. 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