Ultrathin sections of Leishmania amazonensis promastigotes without treatment that presented a normal ultrastructure (A) and promastigotes treated with BZTS at concentrations that corresponded to the IC
(B-D) and IC
(E, G). White arrows indicate swollen mitochondria. Black arrows represent lipid-storage bodies. White arrowheads indicate the presence of vesicles inside the flagellar pocket. The star indicates the presence of concentric membranous structures. n, nucleus; m, mitochondrion; k, kinetoplast; f, flagellum; fp, flagellar pocket. Scale bar = 1 μm.