R&D Systems, a Bio-Techne Brand's Normal Rat IgG Control (Azide Free) is a Rat Polyclonal antibody. This antibody has been shown to work in applications such as: Other. The Normal Rat IgG Control (Azide Free) Antibody was generated using IGHG1, and immunoglobulin heavy constant gamma 1 (G1m marker) as the antigen and it reacts with Rat.