1.M.4. The Spanin4 (Spanin4) Family
A single protein with no homologues in the NCBI database as of 1/1/16 comprises this family. It may be a U-spanin, spanning the inner and outer membranes. it has not been functionally characterized.
Spanin of 203 aas and 2 TMSs, RIO-1_6.
Spanin of Pseudoalteromonas phage RIO-1