Structure of Ald4 in its filamentous form. Left: stacked array of one Ald4 filament, in which three consecutive Ald4 tetramers are colored in different shades of orange. Right: enlarged view of the central three Ald4 tetramers as well as top and side view of the central Ald4 tetramer. The 2-fold axis is represented by an ellipse.
