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Table 2 Spearman’s rank correlation analysis of nucleotide contents in S. elongatus

From: Mutational pressure dictates synonymous codon usage in freshwater unicellular α - cyanobacterial descendant Paulinella chromatophora and β - cyanobacterium Synechococcus elongatus PCC6301

	A₃	T₃	G₃	C₃	GC₃
A	0.522**	0.145**	−0.484**	−0.102**	−0.392**
T	0.002	0.618**	−0.151**	−0.364**	−0.382**
G	−0.303**	−0.339**	0.671**	0.063*	0.382**
C	−0.294**	−0.454**	0.035*	0.559**	0.460**
GC	−0.376**	−0.534**	0.482**	0.288**	0.572**

Correlation analysis between total nucleotide contents and silent base contents of 2342 PCG in the Synechococcus elongatus PCC 6301.
*Significant at p ≤ 0.01 (one tailed).
**Significant at p ≤ 0.001 (one tailed).

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