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Homotypic interaction of wild-type N protein (B) and interaction of C- and N-terminally truncated proteins (C). The strength of the interaction was determined by assaying the β-galactosidase activity with ONPG. Aliquots containing 107 cells of an overnight culture were spotted onto a membrane and stained with X-Gal. Empty vector constructs and SNF1/SNF4 were used as controls (A).
