...antibody’s constant region - specifically, it is determined by a region called the “heavy chain constant ...reagents are molecular tools used in the lab to specifically and tightly bind to other proteins. Antibodies...interest. The protein that an antibody recognizes is called an antigen, while the specific binding site is ...referred to as an epitope. Production Antibodies are typically produced in one of three different methods: in...independently manipulated. Antibodies produced this way are called recombinant antibodies. Recombinant antibodies ...are responsible for binding the antigen, and are called the antigen binding fragments (Fab). The tips of...the Y structure and the lower part of the arms is called the constant region, and is shown in dark blue ...