A) Free merozoite. Gold particles which identify the presence of Pf155/RESA are only associated with dense granules (D). Label is not present on rhoptries (R) or micronemes (Mi). X67,000. B) Immunoelectron micrograph showing gold particles on the ring infected erythrocyte. This localization is characteristic of Pf155/RESA> x48,000.

Aikawa M, Torii M, Sjölander A, Berzins K, Perlmann P, Miller LH. Pf155/RESA antigen is localized in dense granules of Plasmodium falciparum merozoites. Exp Parasitol. 1990 71:326-9. Copyright Elsevier 2010.