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Blockade of TGEV infection by the pAPNs. TGE virons were treated with pAPN proteins at various concentrations and then the viruses were used to infect ST cells. A control protein (IBV S1) produced in the same system as pAPN was used as control to treat viruses. The protein concentration is shown in x-axis and the inhibition rate of the pAPNs determined by plaque assays is indicatd in y-axis. The 100% infectivity value corresponds to an average plaque number of approx. 200.
