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Structural motif
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<p>In a <a href="/facts/Polymer/eF32E50K">chain-like</a> biological <a href="/facts/Molecule/N9ljSfFq">molecule</a>, such as a <a href="/facts/Protein/Jxmagu3E">protein</a> or <a href="/facts/Nucleic_acid/2tTgcI0v">nucleic acid</a>, a structural motif is a common <a href="/facts/Biomolecular_structure/VaN6MEYh">three-dimensional structure</a> that appears in a variety of different, evolutionarily unrelated molecules. A structural motif does not have to be associated with a <a href="/facts/Sequence_motif/RtcoysBD">sequence motif</a>; it can be represented by different and completely unrelated sequences in different proteins or RNA. </p>