Among domestic cattle, a bull is specifically a fertile male; castrated males are called steers and are raised for meat or as beasts of burden when they are called oxen.
The constellation Taurus represents a bull.
See also: Papal bull
... in macrophages and synthesises leukotrines.
Prostaglandins have a wide variety of actions but most cause muscular constriction and inflammation. Other effects can be ...
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