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heteroatom
In organic chemistry, a heteroatom (from Ancient Greek ''heteros'', different, + ''atomos'') is any atom that is not carbon or hydrogen in a ring structure. Usually, the term is used to indicate that non-carbon atoms have replaced carbon in the backbone of the molecular structure. Typical heteroatoms are nitrogen, oxygen, sulphur, phosphorus, chlorine, bromine, and iodine.
In the description of protein structure, in particular in the Protein Data Bank file format, a heteroatom record (HETATM) describes an atom as belonging to a small molecule cofactor rather than being part of a biopolymer chain.〔(【引用サイトリンク】title=Atomic Coordinate Entry Format Version 3.2 )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「heteroatom」の詳細全文を読む
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