Fig. 4: H2S did not inhibit the activities of cell-wall-modifying proteins directly.
From: Hydrogen sulfide inhibits ethylene-induced petiole abscission in tomato (Solanum lycopersicum L.)

Detection of the purified exogenously expressed Cel5 and TAPG4 proteins (a) and the effects of NaHS concentrations on their activities in vitro (b, c). M, protein molecular weight ladder; 1, proteins extracted from uninduced Escherichia coli; 2, proteins extracted from isopropyl β-d-thiogalactoside (IPTG)-induced E. coli; 3, the purified protein. Protein produced by the empty pCold vector was used as a negative control. Data are presented as the mean ± SE (n = 3), and different letters indicate significant differences (P < 0.05).