One of the earliest signs of gastrulation in reptiles, birds and mammals (amniotes) is the appearance of a thickening at the midline of the developing embryo, the primitive streak. Here ...

(B) PIV analysis showing streamlines, indicating an asymmetrical bilateral rotation of the cellular flow during primitive streak extension. (C) Speed plot, indicating the speed of the cellular ...

(B) PIV analysis showing streamlines, indicating an asymmetrical bilateral rotation of the cellular flow during primitive streak extension. (C) Speed plot, indicating the speed of the cellular ...