Figure 1.

The cloverleaf structure of Su6 tRNA as deduced from the DNA sequence is shown. Boxed letters indicate locations where Su6 deviates from the product of the wild-type leuX gene. The ‘N’ shows the location of the nucleotide (designated as position 33.5) inserted to create an eight base anticodon loop. The figure is adapted from Yoshimura et al. (17), with tRNA nucleotide numbering as in Sprinzl et al. (33).