P P- P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 PA PB PC PD PE PF PG PH PI PK PL PM PN PO PP PQ PR PS PT PU PV PW PX PY
Primitive Streak
[A linear band of rapidly proliferating cells that begins near the posterior end of an embryo and grows cranially. Primitive streak is formed during GASTRULATION by the convergent migration of primary ectodermal cells (EPIBLAST). The knot at the tip of the streak is called HENSEN NODE. ( MSH )]
UMLS (NCI) C0033153- Embryonic Structure
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