Glandular extracts, hormones, and enzyme collections are specific to the species, age, and sex of respective animals. Major products such as pepsin, rennin and other digestive enzymes, lipase and trypsin enzymes extracted from the pancreas, bile from the liver, adrenocortical steroids from the adrenal glands, and female reproductive hormones from the ovary are all medically significant products. Though insulin has been referenced as one of the prime pharmaceutical products derived from animal by-products, it is now synthesized by other procedures. This is true for a number of other pharmaceuticals, but reliance on the natural production and extraction is still an important source of medical treatment and prevention compounds.
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