The component of a membrane consisting of the gene products having some covalently attached portion, for example part of a peptide sequence or some other covalently attached group such as a GPI anchor, which spans or is embedded in one or both leaflets of the membrane. [ GOC:mah ]
This is just here as a test because I lose it
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goslim_metagenomics
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Note that proteins intrinsic to membranes cannot be removed without disrupting the membrane, e.g. by detergent.