Fig. 5From: Codon usage and evolutionary dynamics of genetic diversity of novel imported porcine reproductive and respiratory syndrome virus in ChinaA Scatter-plot of CAI of structural protein genes of two novel input PRRSV sub-types. B Scatter-plot of RCDI of structural protein genes of two novel input PRRSV sub-types. C Scatter-plot of FOP of structural protein genes of two novel input PRRSV sub-types. Asterisks indicate significant differences between two groups, 'ns' stands for non-statistical significance, **P < 0.01 and ****P < 0.0001Back to article page