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The extension and the position of the three regions were mapped on the N gene. Region 1 (R1) extends from nucleotides 28,280 to 28,703; region 2 (R2) resulted in the shortest among the three and includes nucleotides from 28,879 to 28,907; the third region (R3) lies at the end of the gene, from nucleotides 28,912 to 29,510.
