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ML phylogenetic tree showing the relationships among the N protein genes of 58 BRSV isolates, 1 ovine RSV (ORSV) isolate, and two human RSV isolates (18537 and hrsvA2). Horizontal branches are drawn to scale, and the tree is rooted with isolate hrsvA2. Designations at the ends of the branches refer to the identifying code of the isolate (Table 1).
