P25 and P28 proteins of the malaria ookinete surface have multiple and partially redundant functions. by Tomas, A, Margos, G, Dimopoulos, G, van Lin, L, de Koning-Ward, T, Sinha, R, Lupetti, P, Beetsma, A, Rodriguez, M, Karras, M, Hager, A, Mendoza, J, Butcher, G, Kafatos, F, Janse, C, Waters, A, Sinden, R