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Table 1 Spearman’s rank correlation analysis of nucleotide contents in P. chromatophora

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	0.579**	−0.252**	−0.263**	−0.277**	−0.373**
T	−0.158**	0.377**	−0.062	−0.210**	−0.204**
G	−0.314**	−0.003	0.358**	0.166**	0.349**
C	−0.357**	−0.119**	0.587**	0.117**	0.502**
GC	−0.413**	−0.082*	0.323**	0.441**	0.536**

Correlation analysis between total nucleotide contents and silent base contents of 786 PCG in the chromatophore genome of P. chromatophora.
*Significant at p ≤ 0.01(one tailed).
**Significant at p ≤ 0.001 (one tailed).

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