FIG. 1.

Schematic illustrations of the hemoflagellate stages discussed in this review. Morphological distinctions include the length of the flagellum and its location, and the position of the kinetoplast with respect to the nucleus of the cell. (A) Promastigote stage of Leishmania spp. found within the insect vector; (B) epimastigote stage typical of Trypanosoma spp. in the insect vector; (C) trypomastigote stage typical of the bloodstream form of Trypanosoma spp.; (D) intracellular amastigote stage of T. cruzi and Leishmania spp. Abbreviations: N, nucleus; K, kinetoplast; F, flagellum. Adapted from reference 60 with permission of the publisher.