TAR RNA forms a stable hairpin that includes a six - residue loop, a trinucleotide pyrimidine bulge, and extensive duplex structure. (science.sciencemag.org)
Furthermore, the majority of mutations in cutaneous melanoma are C → T transitions at pyrimidine dimers, a pattern characteristic of UV - induced DNA damage; mucosal melanoma is not enriched in this mutational pattern. (cancernetwork.com)
The radiation and harsh temperatures broke down pyrimidine in the ice and formed new compounds related to life, such as uracil and cytosine. (discovermagazine.com)