From: Hydrogen Sulfide in Lung Injury:Therapeutic Hope from a Toxic Gas? Anesthes. 2010;113(1):4-6. doi:10.1097/ALN.0b013e3181dec00e Figure Legend: H2S EC50values of aorta as a function of O2concentration. Reproduced with permission from: Koenitzer JR, Isbell GS, Patel HD, Benavides GL, Dickinson DA, Patel RP, Darley-Usmar VM, Lancaster JR Jr, Doeller JE, Kraus DW: Hydrogen sulfide mediates vasoactivity in an O2-dependent manner. Am J Physiol Heart Circl Physiol 2007; 292:1953–60. Date of download: 11/9/2017 Copyright © 2017 American Society of Anesthesiologists. All rights reserved.