Source:http://linkedlifedata.com/resource/umls/id/C0439284
NCI: A unit of concentration (molarity unit) equal to one trillionth of a mole (10E-12 mole) per one liter of solution.,NCI: A unit of concentration (molarity unit) equal to one trillionth of a mole (10E-12 mole) in one liter of solution.(NCI)