- The chitinase PfCHT1 from the human malaria parasite Plasmodium falciparum lacks proenzyme and chitin-binding domains and displays unique substrate preferences. Vinetz, J.M., Dave, S.K., Specht, C.A., Brameld, K.A., Xu, B., Hayward, R., Fidock, D.A. Proc. Natl. Acad. Sci. U.S.A. (1999)