The kidney as an endocrine organ.
D004702:Endocrine Glands / Q000502:physiology*; D004921:Erythropoietin / Q000096:biosynthesis; D006801:Humans; D007668:Kidney / Q000378:metabolism / Q000502:physiology*; D012083:Renin / Q000096:biosynthesis; D014807:Vitamin D / Q000378:metabolism
D004921:Erythropoietin; D014807:Vitamin D; D012083:Renin