Statistical analyses were performed with Student t tests (95% confidence levels) using this software: ns, nonsignificant; ∗ P < 0.05, significant; ∗∗ P < 0.01, very significant; ∗∗∗ P < 0.001, extremely significant.
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Screening and mechanistic study of key sites of the hemagglutinin-neuraminidase protein related to the virulence of Newcastle disease virus.
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