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From Embryology
R G HARRISON, T N A JEFFCOATE A presomite human embryo showing an early stage of the primitive streak. J. Anat.: 1953, 87(2);124-9 PubMed 13044724
R G HARRISON, T N A JEFFCOATE A presomite human embryo showing an early stage of the primitive streak. J. Anat.: 1953, 87(2);124-9 PubMed 13044724