Figure 2
From: Automatic classification of protein structures using low-dimensional structure space mappings
MPSS MATT(C3). A 3D MPSS, constructed using CMDS in conjuction with raw MATT distances. Points in the MPSS are colored by SCOP Class. The reader may note the strong separation of the major protein classes. In particular, small proteins ('g,' green) cluster densely near the origin, while the all alpha ('a,' brown) and all beta ('b,' blue) classes form two roughly orthogonal axial structures. Between these lies the α+β class ('d,' magenta), with the α/β class ('c,' cyan) rising high above the α,β plane.