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A protein is defined when one chain or several associated chains (usually covalently linked) are considered as a unit (monomer).

"Protein" is an instance of the 'molecule type' concept of the 'IDENTIFICATION' concept of the IMGT-ONTOLOGY [1]

[1]Giudicelli, V. and Lefranc, M.-P., Bioinformatics, 15, 1047-1054 (1999). PMID: 10745995 LIGM:221 pdf