Two 3D images of proteins. The protein backbones are shown as ribbons. Alpha helices are shown as purple coloured helices and beta pleated sheets as yellow stretches of ribbon.
The left image is of Acyl Coenzyme A Binding Protein. There are four lengths of alpha helix forming a capital N configuration with the fourth length parallel to one of the verticals.
The right image is of Intestinal Fatty Acid Binding Protein. The roughly oval shaped structure is dominated by a lattice of beta pleated sheets running diagonally across the molecule. To the bottom right are two short stretches of alpha helix.