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n. A nitrogenous organic acid, C4H9N3O2, that is found in the muscle tissue of vertebrates mainly in the form of phosphocreatine and supplies energy for muscle contraction.

n. An amino acid 2-(carbamimidoyl-methyl- amino)acetic acid which naturally occurs in vertebrates and helps to supply energy to muscle and nerve cells

n. A neutral crystallizable organic substance (C4H9N3O2) obtained from muscular tissue. See extract under creatinine. Also spelled creatin, kreatin.

n. an amino acid that does not occur in proteins but is found in the muscle tissue of vertebrates both in the free form and as phosphocreatine; supplies energy for muscle contraction

"Players showed high levels of an enzyme called creatine kinase, which is a sign of vigorous exercise."

aminoalkanoic acid    amino acid   

thymidine    choline    creatinine    beta-carotene    multivitamin    asparagine    folic    lysergic    vasopressin    disodium