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Nitrogen occurs in all organisms, primarily in amino acids (and thus proteins), in the nucleic acids (DNA and RNA) and in the energy transfer molecule adenosine triphosphate. The human body contains about 3% by mass of nitrogen, the fourth most abundant element in the body after oxygen, carbon, and hydrogen.
Amines are organic molecules containing nitrogen and are relatives of ammonia. In amines one of the hydrogen atoms on the nitrogen is replaced with a hydrocarbon group. Depending on how many hydrogens have been replaced by the hydrocarbon group they have been classified into Primary, secondary and tertiary amines. Amines have single bonds between carbon and nitrogen.