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Table 3 Relative Synonymous Codon Usage (RSCU) for ORF2 in lizard, frog and fish L1 and L2 elements, lizard and frog CR1 and zebrafish Crack. The highest RSCU for each amino acid is highlighted in grey. Codons with an A at the third position are in bold

From: Variation in base composition underlies functional and evolutionary divergence in non-LTR retrotransposons