. "\"The process in which relatively unspecialized cells acquire specialized structural and/or functional features that characterize the mesenchymal cells of the renal system as it progresses from its formation to the mature state.\" [GOC:mtg_kidney_jan10, GOC:obol, GOC:yaf]" . . "mesenchymal cell differentiation involved in renal system development" . . "mesenchymal cell differentiation involved in urinary system development" . "mesenchymal cell differentiation involved in urinary tract development" . . . .