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Eric Martz

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	Polypeptide ([[protein]]) chains are linear, with rare exceptions where a side-chain forms an [[isopeptide bond]]. Polypeptide chains may be covalently linked together, most commonly by [[disulfide bonds]].		Polypeptide ([[protein]]) chains are linear, with rare exceptions where a side-chain forms an [[isopeptide bond]]. Polypeptide chains may be covalently linked together, most commonly by [[disulfide bonds]].

	Protein molecules may consist of one or more polypeptide chains, homo-oligomers or hetero-oligomers, homo-multimers or hetero-multimers. The functional form of the molecule, termed the [[biological unit]], often contains a different number of chains than does the crystallographic [[asymmetric unit]]. Examples are given in the article on [[biological units]].		Protein molecules may consist of one or more polypeptide chains. Those with more than one chain may be termed homo-oligomers or hetero-oligomers, homo-multimers or hetero-multimers. The functional form of the molecule, termed the [[biological unit]], often contains a different number of chains than does the crystallographic [[asymmetric unit]]. Examples are given in the article on [[biological units]].