Steroids androgenic, examples

The binding domain for the hormone, or LBD, is situated in the carboxyl half of the receptor, the final portion of which is critical. For example, the deletion of 12 amino acids in the carboxyl end of the androgen receptor suppresses its capacity to bind hormone (O Malley et al. 1974). The LBD has an amino acid composition that confers upon it a net hydrophobic character, suitable for interacting with organic molecules of low molecular weight, such as steroids. 

Hormones are intercellular messengers. They are typically (1) steroids (e.g., estrogens, androgens, and mineral corticoids, which control the level of water and salts excreted by the kidney), (2) polypeptides (e.g., insulin and endorphins), and (3) amino acid derivatives (e.g., epinephrine, or adrenaline, and norepinephrine, or noradrenaline). Hormones maintain homeostasis—the balance of biological activities in the body for example, insulin controls the blood glucose level, epinephrine and norepinephrine mediate the response to the external environment, and growth hormone promotes normal healthy growth and development. 

In terms of chemical nature, some of these are steroids, e.g., estrogens and androgens some are poly peptides for example insulin and endorphins and some others are amino acid derivatives such as epinephrine and norepinephrine. 

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