= Peripheral membrane protein
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A <peripheral membrane protein> associates with a membrane face through noncovalent interactions, without spanning its <hydrophobic> interior. Association with another <membrane protein> can suffice; peripheral describes attachment, not an unimportant function.<Molecular Biology of the Cell, 4th edition by Bruce Alberts and others/Membrane Proteins>[Molecular Biology of the Cell, 4th edition by Bruce Alberts and others; Membrane Proteins Can Be Associated with the Lipid Bilayer in Various Ways: noncovalent attachment and peripheral proteins]{ref}
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