Figure 2.

Structural diagrams of 3nfw. (a) Secondary-structural topology diagram. Red cylinders indicate α-helices and pink arrows represent β-sheets. The beginning and ending amino-acid residue numbers are indicated inside each of the cylinders or arrows, together with the sequential numbers of each secondary-structural component. (b) Ribbon diagram of 3nfw. Pink spirals indicate α-helices and red arrows represent β-sheets. Secondary-structural elements and N- and C-terminal residues are indicated.