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  • Title: The retention of primary hypoblastic cells underneath the developing primitive streak allows for their prolonged inductive influence.
    Author: Azar Y, Eyal-Giladi H.
    Journal: J Embryol Exp Morphol; 1983 Oct; 77():143-51. PubMed ID: 6655430.
    Abstract:
    An experimental study was made of the distribution of the primary hypoblastic cells in the lower layer of the avian blastoderm throughout primitive streak formation and until stage 10 (Hamburger & Hamilton, 1951). The primary hypoblast of stage XIII (Eyal-Giladi & Kochav, 1976) chick blastoderms was exchanged for either an [H3]thymidine-labelled similar chick hypoblast, or a quail primary hypoblast. During the entire period of primitive streak formation, the lower layer proved to be a mosaic of labelled hypoblastic and non-labelled entodermal cells (chick cells of epiblastic origin). The persistance of hypoblastic cells underneath the developing primitive streak is regarded by us as a possible way to prolong the inductive influence of the hypoblast upon the forming streak.
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