Analysis of Codon Usage Bias in the Plastid Genome of <i>Diplandrorchis sinica</i> (Orchidaceae).

Correlation analysis was conducted on various parameter indicators of gene codons ( Figure 2 ), and the results showed that the correlation between GC 1 and GC 2 was extremely significant, but the correlation between GC 3 and GC 1 , GC 2 , and GC 12 was not significant, which indicated that the base compositions of the first and second positions of the gene codon of the encoding gene of the D. sinica plastid were relatively similar, while the base composition of the third position was relatively random and differed from the base compositions of the first and second positions.

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