Identification of Nfa1 protein from a lysate by Western blotting (after 15% SDS-PAGE) with an anti-Nfa1 polyclonal antibody. The lysate of N. gruberi transfected with the pEGFP-C2/nfa1UTR vector was prepared 3 months after G418 treatment. (A and B) Coomassie blue staining after SDS-PAGE and immunoblotting, respectively. Lanes PM, prestained marker; lanes 1, N. gruberi transfected with the pEGFP-C2/nfa1UTR vector; lanes 2, N. fowleri; lanes 3, N. gruberi; lanes 4, N. gruberi transiently transfected with the pEGFP-C2/nfa1 vector.