has part has part has_part characteristic of has modifier osteoblast abnormal osteoblast morphology abnormal osteoblast cell number MP:0004987 MPheno.ontology deviation from the average number of the skeletogenic cells that secrete osteoid, are capable of producing mineralized (hydroxyapatite) matrix, are located adjacent to or within osteoid tissue, and arise from the transformation of a preosteoblast cell amount abnormal