Nonlinear projection of RDFs. The SOM was run using an RDF with an Epanechnikov neighborhood function in a [46, 28]-sized rectangular lattice (left) and a magnified section (right). Following training, each node was colored according to the enzymes or catalytic residues in the RDFs that were mapped onto it. The size of the squares or triangles indicates the relative frequency of the mapped RDFs.
Ueno et al. BMC Structural Biology 2012 12:5 doi:10.1186/1472-6807-12-5