Nick Hud, Georgia Institute of Technology (IMAGE) Georgia Institute of Technology Caption Nearly twins and possibly keys to a unlocking the mystery of the evolution of life-coding molecules. Nicholas Hud holds up Uracil, on the right, a nucleobase of RNA. Barbituric acid, on the left, looks very much like it and could have been part of a proto-RNA that preceded RNA. Credit Fitrah Hamid, Georgia Tech Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.