Of the two types of Human immunodeficiency virus (HIV) which have been characterized, HIV-1 is more infective and is prevalent globally. The protein known as p24 is a 24 kDa protein often referred to as the core or capsid protein of HIV-1. Levels of p24 in blood may be used as indicators of the progression of HIV. The HIV virion is encapsulated by a viral envelope that contains complexes of surface proteins including glycoprotein 120 (gp120), which are important for the virus to attach and fuse to infect target cells. This antibody was generated from HIV-infected individuals by the Epstein-Barr virus transformation of peripheral blood mononuclear cells (PBMCs) method.