Western blots of IOV binding assay for A) D90c and B) Mature parasite-infected erythrocyte surface antigen (MESA). E. coli-expressed purified proteins, MBP-D90c-His and MBP-MESA at concentrations ranging from 0.0008 μM to 0.023 μM were separately incubated overnight with 10 μg of erythrocyte IOVs, collected by centrifugation, washed, and subjected to SDS-PAGE analysis and western blotting using anti-MBP antibody. Blots were reprobed with anti-actin antibody to demonstrate equal loading. MESA and MBP-His protein were included as positive and negative controls, respectively. Molecular weight markers (sizes in kDa) are indicated at left.