sentences: thymine is found in dna
docs: thymine is pyrimidine. thymine_deoxyribonucleotide is deoxyribonucleotide. mitochondrial_dna is dna. thymine is nitrogen_base. thymine is chemical_compound. thyronamine is chemical_compound. thymine is nucleobase. thymine_deoxyribonucleotide is organic_matter. thyronamine is phenol.