Experiential function prediction using PSPACE. Screenshots of PSPACE user interface elements during experiential function prediction. (A) Dense cluster of NTF-2-like chains surrounding 3FH1.A strongly suggests NTF-2-like designation. (B) Dispersed homeodomain and "winged helix" clusters around 3H92.A. (C) The k-nearest neighbors dialog populated with the structural neighborhood of 3LNO.A. Redox-active proteins in general and Fe-4S cluster assembly chains in particular are highly represented.