has part has part has_part characteristic of has modifier axial mesoderm formation abnormal axial mesoderm morphology failure or abnormality in the formation of part of the middle of the three primary germ layers of the embryo which includes the prechordal mesoderm and the chordamesoderm and gives rise to the prechordal plate and to the notochord MPheno.ontology MP:0001684 abnormal mesoderm morphology quality abnormal