letter/J Post author By thebiotech Post date October 5, 2015 ← KX2-391 is an orally-bioavailable highly-selective small molecule Src-family kinase inhibitor → immunodeficiency virus type 1 (HIV-1) protease (PR) is a retroviral aspartyl immunodeficiency virus type 1 (HIV-1) protease (PR) is a retroviral aspartyl immunodeficiency virus type 1 (HIV-1) protease (PR) is a retroviral aspartyl