Nonstructural protein 1/NS1 plays multiple roles in viral infection.It inhibits cellular pre-mRNA processing by binding to CPSF4 and PABPN1, disrupting normal 3' end processing and halting host protein synthesis.Non-structural protein 1/NS1 Protein, H1N1 (His) is the recombinant Virus-derived Non-structural protein 1/NS1 protein, expressed by E.coli , with N-His labeled tag.