heterotsüklilise puriini aluselised derivaadid, millest adeniin ja guaniin kuuluvad nukleiinhapete koostisse
any of a group of chemical compounds of which purine is the base, including adenine, guanine, xanthine and hypoxanthine which are constituents of nucleic acids, nucleotides and coenzymes
... polynucleotide substances (including gene transfer and antisense substances), consisting of two or more distinct nucleotides where:
- the difference in the nucleotide sequence of the purine and pyrimidine bases or their derivatives is not major.
