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Maximum likelihood phylogenetic tree derived from an alignment of 14 complete HPIV3 genome sequences. Bootstrap confidence values of >70% (from 500 tests) are indicated. The lab-adapted strains used here are the original laboratory strain (34) and three neuraminidase-resistant variants (NRVs) selected for resistance to exogenous neuraminidase: NRV-0 (12), NRV-1 (8, 10), and NRV-2 (11).
