I am trying to find a tool that performs structure structure alignment for two sequences given their residues using combinatorial extensions (CE). I found a tool based on combinatorial extensions provided by the protein data bank: http://source.rcsb.org/jfatcatserver/. However I was wondering if there is any python module or a class for structure to structure alignment that I can implement. I have found the structure Alignment tool from Bio.PDB, but is poorly documented. is there any python module or library that implements this method? Thanks.