Members of BAR superfamily adopt folds with different degrees of curvature. BAR modules (one monomer in orange and the other in ice-blue) from different subfamilies viewed from the side (left). PDB codes are given in brackets. BAR modules viewed from the bottom (right) are coloured according to the properties of their residues: red for negative, blue for positive, green for polar and white for non-polar. (a) Amphiphysin, (b) endophilin, (c) FCHo, (d) ACAP1, (e) SNX9, (f) MIN.