Rehman Shahzad, Saba Irshad, Malik Saddique Mehmood and Faisal Amin, 2022. Adaptive Mutations in Nuclear Export Protein and Non-Structural 1 Protein of Avian Influenza a H9N2 Virus Circulating in Punjab, Pakistan. Pakistan J. Zool., 54: 761-769. DOI: https://dx.doi.org/10.17582/journal.pjz/20191216081232