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primitive node


Definition: a local thickening of the epiblast at the cephalic end of the primitive streak of the embryo (the node is an embryonic organizer).

Synonym(s): Hensen knot, Hensen node, Hubrecht protochordal knot, primitive knot, protochordal knot

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.