Source:http://linkedlifedata.com/resource/umls/id/C0028622
MSH: Complex compounds of high molecular weight occurring in living cells. These are basically of two types, ribonucleic (RNA) and deoxyribonucleic (DNA) acids, both of which consist of nucleotides (nucleoside phosphates linked together by phosphate bridges).,NCI: A header concept for chemicals that are the building blocks of inherited genetic information. The monomer structure (nucleoside) contains either a purine or pyrimidine base linked to a deoxyribose or ribose carbohydrate group. Nucleotides are composed of a nucleoside and one to three phosphate groups. Nucleic acids are polymers of nucleotides that are linked by phosphodiester bonds.