Uracil's chemical structure
, abbreviated U, is a pyrimidine base
. It appears blue in EteRNA. Uracil pairs with adenine
. Uracil is unique to RNA, and does not appear in DNA, being replaced by thymine
Uracil (in Blue) bonding with both Adenine (in Yellow) and Guanine (in Red) with a Guanine boost inside the loop.