>d1sivb_ b.50.1.1 (B:) Simian immunodeficiency virus (SIV) protease {Simian immunodeficiency virus, different strains} pqfslwrrpvvtahiegqpvevlldtgaddsivtgielgphytpkivggiggfintkeyk nvkievlgkrikgtimtgdtpinifgrnlltalgmslnl