Table 2.

Structural information improves the classification accuracy of synonymous codon identity.

Secondary structure	Dihedral angle input	Accuracy using true angles	Accuracy using random angles	Accuracy degradation using random angles	% Accuracy degradation using random angles	p value
$\beta$ mode	$\varphi$ and $\psi$	0.38	0.30	0.08	20.7	< 0.001*
	$\varphi$	0.38	0.30	0.07	19.6	< 0.001*
	$\psi$	0.36	0.30	0.05	15.2	< 0.001*
$\alpha$ mode	$\varphi$ and $\psi$	0.36	0.32	0.04	10.6	< 0.001*
	$\varphi$	0.34	0.32	0.03	7.3	< 0.001*
	$\psi$	0.35	0.32	0.03	7.5	< 0.001*

Significant results (p value $<0.05$) are indicated with *.