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Comparison of S1 amino acid sequences of PEDV isolates from this study with those of reference strains (GenBank nos. AF353511.1, KT323979.1, KF272920.1, KC210145.1, and JX188454.1). (A) A 3-aa insertion (381KPI383) was found in the PEDV HN/SY/2017/Oct strain, and a 1-aa deletion (K) was found at position of 372 in the PEDV ZJ/2018/May strain. (B) Amino acid sequence variations in three epitope regions (aa 201-212, aa 748-755, and aa 764-771) in the S1 genes of 14 PEDV strains
