primitive streak formation
http://purl.obolibrary.org/obo/GO_0090009
The developmental process pertaining to the initial formation of the primitive streak from unspecified parts. The primitive streak is a ridge of cells running along the midline of the embryo where the mesoderm ingresses. It defines the anterior-posterior axis. [ GOC:dph GOC:tb GOC:sdb_2009 ]
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- anatomical structure formation involved in morphogenesis and results in formation of some primitive streak