Procyclic forms of Trypanosoma brucei isolated from the midguts of infected tsetse flies, or freshly transformed from a strain that is close to field isolates, do not use a complete Krebs cycle. Furthermore, short stumpy bloodstream forms produce acetate and are apparently metabolically preadapted to adequate functioning in the tsetse fly.,
Eukaryotic Cell (Print)
Erasmus MC: University Medical Center Rotterdam

Grinsven, K. W. A., van den Abbeele, J., van den Bossche, P., van Hellemond, J., & Tielens, L. (2009). Adaptations in the glucose metabolism of procyclic Trypanosoma brucei isolates from tsetse flies and during differentiation of bloodstream forms. Eukaryotic Cell (Print), 8(8), 1307–1311. doi:10.1128/EC.00091-09