I don't know whether Pfam has any HMMs for split domains, but Superfamily certainly does, because Julian Gough and I had several discussions about the best way to represent them with SAM HMMs. It turned out that the usual SAM-T99 or SAM-T2k script does a pretty good job if this the inserted domain is put in lower-case and the surrounding domain is put in upper-case in the initial seed. Kevin Karplus