Subcellular localization of PfPLP1 in schizonts and merozoites of P. falciparum. (a) Co-immunostaining of PfPLP1 (green) with merozoite surface protein MSP1 (red). (b) Co-immunostaining of PfPLP1 (green) with micronemal protein EBA-175 (red). PfPLP1 colocalizes with EBA-175 (colocalization coefficient being more than 0.75). (c) Co-immunostaining of PfPLP1 (green) with rhoptry protein CLAG3.1 (red). PfPLP1 is not localized in rhoptry. Nuclei were counterstained with DAPI and Scale bar, 2 mm. (d) Immunoelectron microscopy of PfPLP1. Ultrathin sections of merozoites and late-stage schizonts were labelled with anti-PfPLP1 mouse sera followed by gold-labelled (15 nm) anti-mouse IgG secondary antibodies. Gold particles were detected in elongated, membrane-enclosed micronemes towards the apical end in schizonts and merozoites. Scale bar, 500 nm. PfPLP1 is localized to the micronemes of merozoites.

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