Exposure to this compound results in myocardial and brain ischemia because it shifts the dissociation curve of hemoglobin to the left by binding to it several times more strongly than oxygen does.
In 2002, Dioum et. al. discovered that this compound lowers NPAS2's ability to bind to DNA, enabling it to partake in circadian rhythm control.  Iron, nickel, and sulfur partially comprise the dehydrogenase named for this compound in methanogenic bacteria, for which this compound is a nutrient needed for acetyl CoA synthesis. Biliverdin and this compound are produced when heme oxygenase cleaves heme. Along with cyanide, this compound inhibits complex IV of the electron transport chain. Exposure to this compound results in myocardial and brain ischemia because it shifts the dissociation curve of hemoglobin to the left by binding to it several times more strongly than oxygen does. For 10 points, name this poisonous diatomic gas resulting from incomplete combustion.
In 2002, Dioum et. al. discovered that this compound lowers NPAS2's ability to bind to DNA, enabling it to partake in circadian rhythm control.  
carbon monoxide [or CO]