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HA and NP RNA levels in infected cells. Vero (A) and A549 (B) cells were either mock infected (M) or infected with either wild-type (WT) rVN1203 HALo or rVN1203 HALo NS1 1-73 virus at an MOI of 5. At the indicated time points, total RNA was harvested and was subjected to primer extension analysis.
