Open reading frame 132 of Helicoverpa armigera nucleopolyhedrovirus encodes a functional per os infectivity factor (PIF-2).
Fang M, Nie Y, Wang Q, Deng F, Wang R, Wang H, Wang H, Vlak JM, Chen X, Hu Z. Open reading frame 132 of Helicoverpa armigera nucleopolyhedrovirus encodes a functional per os infectivity factor (PIF-2). J Gen Virol. 2006 Sep; 87(Pt 9):2563-2569.