N-terminal 4-TMS DMT-like Protein (N4D) Superfamily
The members of families 9.B.54 and 9.B.106 usually have N-terminal 4 TMS domains (often in a 2 + 2 TMS arrangement) that bring up each other in TC BLAST searches.
9.B.106 -
The Pock Size-determining Protein (PSDP) Family