part of part of has part has part has_part characteristic of has modifier ornithine decreased circulating amino acid level decreased ornithine level abnormal circulating ornithine level decreased circulating ornithine level 2018-08-30T10:03:39Z MPheno.ontology decreased serum ornithine level decreased plasma ornithine level reduced circulating ornithine level MP:0030651 hypoornithinaemia reduction in the amount per unit of blood of ornithine, an amino acid only rarely found in proteins, but which is important in living organisms as an intermediate in the reactions of the urea cycle and in arginine biosynthesis hypoornithinemia abnormal decreased amount blood