Apical membrane antigen 1 (AMA-1) is a Plasmodium asexual blood-stage antigen. It has been suggested that positive selection operates on the AMA-1 gene in regions coding for antigenic sites [1].

1: Protective immune responses to apical membrane antigen 1 of Plasmodium chabaudi involve recognition of strain-specific epitopes. Crewther PE, Matthew ML, Flegg RH, Anders RF; Infect Immun 1996;64:3310-3317. PMID:8757869