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Example sentences for: trnas
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Currently, only the type I tRNAs [ 81 ] are included here; the tRNAs are collected in 19 functional subgroup alignments and one total type I alignment.
Since rare tRNAs generally correspond to rare codons [ 27], we checked whether a bias in codon usage was correlated with readthrough efficiency.
Buchnera has only 32 tRNAs, with most amino acids having only one.
When E. coli Bl21(DE3), a strain that did not express additional rare tRNAs, was transformed with the cloned T. acidophilum ATPase A subunit, no additional protein bands were observed in extracts of induced cells (not shown).
Selection enforces the retention of at least one tRNA for each amino acid, as observed in modern Buchnera , so the early fixation of large deletions containing some tRNAs would have created a selective requirement for the retention of others.
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