A creatine-phosphoric acid compound that occurs in muscle is the energy source in muscle contraction, creatinine.
Phosphate form of the muscle protein creatine, which is used as an energy source for muscle flexion.
A compound found in muscle. It is important as an energy source, yielding phosphate and creatine in this process, and releasing energy that is used to synthesize adenosine triphosphate.
A molecule of creatine that has undergone phosphorylation and functions as a readily available store of high-energy compounds is denoted as PCr.