This family consists of several ookinete surface proteins (Pvs28) from several species of Plasmodium. Pvs25 and Pvs28 are expressed on the surface of ookinetes. These proteins are potential candidates for vaccine and induce antibodies that block the infectivity of Plasmodium vivax in immunised animals [1]. The structure of this protein shows it is composed of four EGF domains [2].

1: Antibodies to Plasmodium vivax transmission-blocking vaccine candidate antigens Pvs25 and Pvs28 do not show synergism. Hisaeda H, Collins WE, Saul A, Stowers AW; Vaccine 2001;20:763-770. PMID:11738740

2: The essential mosquito-stage P25 and P28 proteins from Plasmodium form tile-like triangular prisms. Saxena AK, Singh K, Su HP, Klein MM, Stowers AW, Saul AJ, Long CA, Garboczi DN; Nat Struct Mol Biol. 2006;13:90-91. PMID:16327807