= Protein structure
{wiki}
<Protein structure> describes both the chain's chemical organization and its spatial arrangement. Four levels answer different questions: <protein primary structure> gives the order; <protein secondary structure> gives recurring local patterns; <protein tertiary structure> gives one chain's overall arrangement; <protein quaternary structure> gives the assembly of multiple chains. These are levels of description, not four mandatory stages that every <protein> must pass through. See https://openstax.org/books/biology-2e/pages/3-4-proteins[Clark, Douglas and Choi: four levels of protein structure].
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