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Expression and purification of rEtCHP18905. (A) SDS-PAGE analysis of the 5rEtCHP18905. Lanes 1, protein marker; 2, negative control (not induced with IPTG); 3, the rEtCHP18905 protein with the GST-tag protein of the vector (induced with IPTG for 6h). (B) Western blot analysis of purified rEtCHP18905 protein. Lane 2, protein recognized by an anti GST-Tag monoclonal antibody. (C) Western blot analysis of purified rEtCHP18905 protein. Lane 2, protein recognized by rabbit sera against sporozoite, lane 4 incubated with naïve rabbit serum.