tRNA Molecule (image) Institute for Research in Biomedicine (IRB Barcelona) Share Print E-Mail Caption This is a 3-D representation of a transfer RNA (tRNA). These molecules are crucial for the translation of genes into proteins and they are also the reason why the genetic code cannot exceed 20 amino acid. Credit (Author: Pablo Dans, IRB Barcelona) Usage Restrictions None Share Print E-Mail 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.