<prompt> Vasodilator Nitric oxide is derived from which of the following:ProlineHistidineArginineLysine  <response>: Derivatives of amino acids Proline is conveed to glutamate by a series of steps and then transaminated to alpha-ketoglutarate Histidine on decarboxylation, gives the corresponding amine i.e. histamine Arginine is the substrate for the production of nitric oxide NO 