Ipilenukleu pirimidini karuun, urasili (kikekuru si U), lo undipo timini ninu RNA, o si yato si timini nkpa pe ko ni adipo metili ninu oruka re.. 
gfa-j- is a rod-shaped extremophile Bacterium in the family halọ́mọ—dárúkọ that, when starved of phosphorus, may be capable of incorporating the usually poisonous element Táwọn in its DNA.. 