(A) Schematic representation of the LFn control and LFn-ZIKV and -DENV fusion proteins. aa, amino acid. (B) Western blot analysis of the purified proteins LFn-ZIKV-NS3-protease (ZIKV P), LFn-ZIKV-NS3-helicase (ZIKV H), LFn-DENV-NS3-protease (DENV P), and LFn-DENV-NS3-helicase (DENV H) C, LFn control. Arrowheads indicate the size of the proteins. Molecular size marker units are kilodaltons.