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Alignment of GP3 and GP4 protein aa sequences of Chinese PRRSV-1 strains. (A) Alignment of the partial ORF3 aa sequences of Chinese PRRSV-1 strains. (B) Alignment of the partial ORF4 aa sequences of Chinese PRRSV-1 strains. The aa deletion regions are shown in blue or yellow. Termination codons are indicated by an asterisk (*). The C-terminal truncation mutants are shaded in red. Chinese PRRSV-1 is indicated with a red triangle.
