https://www.eurekalert.org/pub_releases/2020-09/tfci-pii092420.php
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https://www.eurekalert.org/pub_releases/2020-09/tfci-pii092420.php
origin - https://www.pipiscrew.com/?p=19111 placenta-is-initiated-first-as-cells-of-a-fertilised-egg-divide-and-specialise