Ключевые слова: acid, adenine, adenosine, atom, base, biochemistry, block, cage, carbon, chemical, chemical structure, chemistry, chromosome, code, component, compound, dna, drug, formula, gene, genetic, genome, glycosidic bond, helix, hydrogen, illustration, isolated, molecular, molecule, neuromodulator, nitrogen, nitrogenous, notebook, nucleic, nucleoside, nucleotide, organic chemistry, organic compound, oxygen, purine, ribofuranose, ribose, rna, science, sheet, structural formula, structure, study,