has part has part has_part characteristic of part of has modifier abnormal renal tubule morphology abnormal distal convoluted tubule morphology any structural anomaly of the convoluted portion of the duct system of the nephron between the ascending portion of the loop of Henle and the collecting duct system in the kidney cortex; it is partly responsible for the regulation of potassium, sodium, calcium, and pH through the endocrine system MPheno.ontology MP:0004757 morphology abnormal distal convoluted tubule