Choline
= Choline
<Choline> is a positively charged organic ion containing a trimethylammonium group and a two-carbon chain ending in a <hydroxyl group>. Its permanent positive charge distinguishes it from an amine that is neutral until protonated.
<Choline> is part of <phosphatidylcholine> and a precursor of <acetylcholine>. These roles connect one small molecular headgroup with both <cell membrane> structure and chemical communication.