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Small molecules are low molecular weight molecules that include lipids, monosaccharides, second messengers, other natural products and metabolites, as well as drugs and other xenobiotics. Larger structures such as nucleic acids and proteins, and many polysaccharides are not small molecules, although their constituent monomers (ribo- or deoxyribonucleotides, amino acids, and monosaccharides, respectively) are often considered small molecules.