
Sequence and cloverleaf structure of Halobacterium species NRC-1, Escherichia coli, and Homo sapiens tRNACys, in which the conserved U73 and the GCA anticodon are circled. Nucleotides of the Halobacterium sp. NRC-1 that have been tested by mutations are indicated by arrows, and the effects of mutation in reducing the catalytic efficiency of aminoacylation are indicated in parentheses.










