An obstruction causing an embolism: a blood clot, air bubble or other matter carried by the bloodstream and causing a blockage or occlusion of a blood vessel.
The structure on the end of the palp of male arachnids which contains the opening to the ejaculatory duct.
A regulation or limitation that restricts.
The act of restricting, or the state of being restricted.
The mechanism by which a cell degrades foreign DNA material.