Ribbon view of 2NXF

Ribbon view of 2NXF showing the 4-layer alpha/beta sandwich structure described by the SCOP classification. The structure shows that the outer layers of the protein are dominated by alpha helices, while the centre of the protein consists of two ditinct layers of beta sheets. This structure contains 20 anti-parallel beta sheets, coloured yellow and 12 alpha helices, shown in red; coiled regions are shown in green.