noun: (molecular biology) Initialism of polymerase chain reaction. [(molecular biology) A technique in molecular biology for creating multiple copies of DNA from a sample; used in genetic fingerprinting etc.]
noun: (medicine) Initialism of protein/creatinine ratio.
noun: (biochemistry) Abbreviation of phosphocreatine. [(biochemistry) A phosphorylated derivative of creatine that is used in muscles to store chemical energy]