part of part of has part has part characteristic of inheres in has modifier creatine Abnormal circulating creatine concentration 2012-09-16T04:29:41Z Creatine metabolism abnormal HP:0012113 UMLS:C4020731 Abnormality of creatine metabolism A deviation from the normal concentration of creatine in the blood circulation. Creatine is a derivative of glycine having methyl and amidino groups attached to the nitrogen. Creatine is naturally produced from amino acids, primarily in liver and kidney, and acts as an energy source for cells, primarily for muscle cells. Abnormal circulating organic compound concentration amount abnormal blood