Classification of the short and long forms of chitinase found in different Plasmodium species. Long forms of chitinases have a proenzyme and putative chitin-binding domain in addition to substrate-binding and catalytic domains, whereas short-form chitinases lack proenzyme and putative chitin-binding domains. (SP, signal peptide; LCR, low-complexity region; CBD, chitin-binding domain). Plasmodium parasites infecting gorillas are shown in orange, chimpanzees in black, humans in red, birds in blue, monkeys in magenta, and rodents in green. (This figure was created with BioRender.)