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Sequence alignments of partial spike genes and 3’ untranslated regions (UTRs) of different porcine deltacoronavirus strains, performed using the MUSCLE program in the MEGA software package. Red rectangles indicate the 3-nt deletion sites. The first nucleotide of each codon is shown in bold in the spike alignment. A dot indicates that the nucleotide exactly matches the strain HKU15-44. A dash indicates a nucleotide deletion compared to the strain HKU15-44 (color figure online)
