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.
Examples:
TC#	Name	Organismal Type	Example
1.M.4.1.1	Spanin of 203 aas and 2 or 3 TMSs, RIO-1_6.		*Spanin of Pseudoalteromonas* phage RIO-1**

1.M.4.1.2	One component spanin of 189 aas and 2 (possibly 3) TMSs, N- and C-terminal, with one possible TMS adjacent to the N-terminal TMS.		*Spanin of Pseudoalteromonas* phage HP1**

Examples:
TC#	Name	Organismal Type	Example
Examples:
TC#	Name	Organismal Type	Example