Primitive streak

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(Anat.) an opaque and thickened band where the mesoblast first appears in the vertebrate blastoderm.

See also: Primitive

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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They are believed to originate from early gestation from totipotential cells of Hansen's node, a remnant of these primitive streaks in the coccygeal origin (2).