This week we have released a major upgrade to those efforts. Our pre-computed alignments are now using domain information to split protein chains into smaller subunits. We introduced this change because many proteins are built of more than just one domain. In that case our previous results were a bit unclear in the sense that results for any of the domains were displayed together and that made the data more difficult to compare and interpret.
The new domain based procedure is using the SCOP domain assignments where available to define how to break up protein chains. If the structures are too new to be annotated by SCOP (like all newly released proteins), then we use a software called ProteinDomainParser to define domains based on geometric criteria. Even if the algorithm sometimes defines a break point that might not be the same what SCOP would define, it is still interesting if you find structural neighbors with such fragments of proteins.