tissue molecular composition measurement tissue protein/peptide composition measurement 2014-08-26T13:32:08Z Any measurement involving the composition, that is, the absolute amount, relative amount or type of one or more proteins (complex high molecular weight organic compounds containing carbon, hydrogen, oxygen, nitrogen, and sulfur consisting of alpha-amino acids joined by peptide linkages) or peptides (low molecular weight compounds composed of at least two amino acids joined by peptide linkages) in a specified tissue or set of tissues. JSmith