| http://www.w3.org/ns/prov#value | - lkyl, alkenyl, or alkynyl group; R4 is an alkyl group, an alkenyl group, an alkynyl group, or an alkyl, alkenyl, or alkynyl containing acyl group; R5 is an alkyl group, an alkenyl group, an alkynyl group, or an alkyl, alkenyl, or alkynyl containing acyl group; and X- is an anion that assist in the transport of selected macromolecules and other substances into and past membrane barriers.
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