Antigen
Antigens are "targeted" by antibodies. Each antibody is specifically produced by the immune system to match an antigen after cells in the immune system come into "contact" with it; this allows a precise identification or matching of the antigen and the initiation of a tailored response. The antibody is said to "match" the antigen in the sense that it can bind to it due to an adaptation in a region of the antibody; because of this, many different antibodies are produced, each able to bind a different antigen while sharing the same basic structure. In most cases, an adapted antibody can only react to and bind one specific antigen; in some instances, however, antibodies may cross-react and bind more than one antigen.
List of antiandrogens
This is a list of antiandrogens, or drugs that prevent the effects of androgens like testosterone and dihydrotestosterone (DHT). It includes direct antagonists of the androgen receptor (AR), androgen synthesis inhibitors like 5α-reductase inhibitors and CYP17A1 inhibitors, and antigonadotropins like analogues, estrogens, and progestogens. In addition, it includes both steroidal antiandrogen (SAAs) and nonsteroidal antiandrogen (NSAAs). Only antiandrogens that have been marketed are included in this list.Note that in addition to acting as AR antagonists, most SAAs also act as potent progestogens and therefore antigonadotropins.