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Primordial Gut

Intraembryonic endoderm from the head, tail, and lateral folds of the early embryo that incorporate the dorsal part of the yolk sac, forming a tube… 
National Institutes of Health

Papers overview

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1967
1967
THE DEMONSTRATION that immunoglobulin production was normal or minimally impaired in neonatally thymectomized animals1-3has led…