NFEPP NFEPP Fentanyl Fentanyl
pH 6.5 7.4 6.5 7.4
EC50 (mean) 1,340e-007* 7,943e-007 2,905e-008 4,709e-008
standard error 3,594e-008 2,644e-007 4,103e-009 1,081e-008