activator

ac*ti*vate

verb

{bc}to make {a_link|active} or more active: such as

{bc}to make (something, such as a molecule) reactive or more reactive

{bc}to convert (something, such as a provitamin) into a biologically active derivative

tissue plasminogen activator

noun

{bc}a clot-dissolving enzyme with an affinity for fibrin that is produced naturally in blood vessel linings and is used in a genetically engineered form to prevent damage to heart muscle following a heart attack and reduce neurological damage following ischemic stroke