In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 Of 3841 serum samples from sows received from the Tennessee State Diagnostic Laboratory in 1991 - 1992 , 1130 were positive for Toxoplasma gondii antibody .
Toxoplasma gondii antibody

 7 - Nitroindazole ( 7NI ) , a relatively selective neuronal nitric oxide synthase ( nNOS ) inhibitor . was intraperitoneally administered to the guinea pigs 30 minutes before the onset of local anoxia .
nitric oxide synthase

 Coronary vasoconstriction caused by endothelin - 1 is enhanced by ischemia - reperfusion and by norepinephrine present in concentrations typically observed after neonatal cardiopulmonary bypass .

endothelin - 1