has part has part has_part characteristic of part of has modifier abnormal enamel knot morphology MPheno.ontology csmith any structural anomaly of a transient cluster of cells in the central part of the dental epithelium facing the dental mesenchyme, which acts as an organizing center, providing positional information for tooth morphogenesis and regulating the growth of tooth cusps 2011-02-22T02:46:53Z MP:0010864 abnormal inner dental epithelium morphology morphology abnormal enamel knot