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SNP density and Tajima’s D along the NDV genome for samples from multiple NDV infections. The gray shadings outline protein coding regions. NP: nucleocapsid protein, P: phosphoprotein, M: matrix protein, F: fusion protein, HN: haemagglutinin-neuraminidase protein, L: RNA polymerase. Sample_1 of each infection condition is black, sample_2 is blue and sample_3 is red. Positions with no points mean that these positions have no SNPs.
