Source:http://linkedlifedata.com/resource/umls/id/C0439282
NCI: A unit of concentration (molarity unit) equal to one billionth of a mole (10E-9 mole) of solute in one liter of solution.,NCI: A unit of concentration (molarity unit) equal to one billionth of a mole (10E-9 mole) of solute in one liter of solution.(NCI)