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Cloverleaf structure of tRNAAsp from yeast and E. coli. The circled bases in yeast tRNAAsp differ from the corresponding base in E. coli tRNAAsp. The shaded bases are important for in vitro aspartylation of tRNAAsp (Pütz et al. 1991; Nameki et al. 1992). The ‘ symbol is an alignment gap. Standard position numbers are indicated. Q is a modified derivative of G. Other modified bases in E. coli tRNAAsp are indicated.
