has part has part has_part characteristic of has modifier abnormal conotruncal ridge morphology absent conotruncal ridges MP:0010586 csmith absent bulbar ridges MPheno.ontology absent endocardial ridges absent conotruncal cushion absent outflow tract cushions absent conotruncal cushions absence of the pair of spiral mesenchymal swellings in the primordial ventricular outflow tract, that eventually fuse to form the conotruncal septum, dividing the subvalvular outflow tract and contributing to the membranous interventricular septum absent aortico-pulmonary spiral ridges 2010-10-05T02:26:19Z abnormal absent conotruncal ridge