abnormal gastrulation abnormal embryo turning Abnormal Turning of Embryo GO:0007669 In mouse, this event occurs at E8.5-E9.5. MP:0001700 MPheno.ontology abnormal embryonic axial rotation atypical axial rotation of the germ layers of the embryo during the primitive streak/early somite stage during which the curvature of the entire trunk region is normally reversed and the neural ectoderm moves to the convex region and the midgut region becomes located in the concave region