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Effects of furosemide on stimulus-induced population activity: field potentials in str. pyramidale in response to afferent stimuli at different intensities (95–235 µA) before (control) and after 30-min perfusion of furosemide (2.5 mM). Note that in the presence of furosemide the 100-µA stimulus becomes subthreshold (with respect to the PS) and an extra PS is apparent with the 235-µA stimulus (indicated by arrow). Asterisks denote stimulus artifacts.
