Source:http://linkedlifedata.com/resource/umls/id/C0567416
NCI: An aggregate of two or more atoms in a defined arrangement held together by chemical bonds.,CHV: The smallest particle of a substance that retains the chemical and physical properties of the substance,CHV: The smallest particle of a substance that retains the chemical and physical properties of the substance,NCI: The smallest particle of a substance that has all of the physical and chemical properties of that substance. Molecules are made up of one or more atoms. If they contain more than one atom, the atoms can be the same (an oxygen molecule has two oxygen atoms) or different (a water molecule has two hydrogen atoms and one oxygen atom). Biological molecules, such as proteins and DNA, can be made up of many thousands of atoms.