It binds with high affinity across multiple melanocortin receptor subtypes: MC1R (Ki approximately 0.67 nM), MC4R (approximately 6.6 nM), MC3R (approximately 34 nM), and MC5R (approximately 46 nM)
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However, when excessive amounts of acetaminophen are ingested, the livers supply of glutathione can be depleted rapidly, leaving NAPQI unneutralized.[ref] Glutathione is the master antioxidant, but there are several situations in which glutathione levels may already be low and thus unable to rise to the occasion for high doses of acetaminophen
Comfort : The formula contains lidocaine, a mild anesthetic, to ensure that the procedure is as comfortable as possible
N Engl J Med 1988;319:1557-62