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HAd and NA activities of NDVs bearing different HN proteins. Vero cells were infected with three viruses at 0.1 MOI for 24 h, and then detected for the HAd activity (A) and the NA activity (B), respectively. HAd and NA activities of NDV are normalized to the expression of the values for rMukteswar, which was set at 100%. ** p < 0.01, *** p < 0.001, and **** p < 0.0001.
