作者: D. Buffe , C. Rimbaut , J. A. Gaillard
DOI: 10.1007/978-3-642-77852-0_6
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摘要: It is possible that the first observations of human yolk sac (HYS) were made nearly 3 centuries ago (Lucien and Vermelin 1933); however, our present knowledge still far from complete. The lack available material in a suitable condition makes it difficult to study HYS, structure functions which are not yet properly understood; investigation its biochemistry complex task indeed.