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9.B.239. The Uncharacterized Bacterial 10 - 13 TMS Protein (UBP2) Family 

This family consists of proteins that vary in size and topology (10 - 13 TMSs) and may be distantly related to the family with TC# 9.B.142, a family of glycosyl transferases, but this is not established. NCBI BLAST searches bring up many homologues in both cultered and uncultured bacteria. It contains no recognizable Pfam domains.