Structures of Umud' and Type I signal peptidase. E.coli Umud' (SCOP d1ay9a_)  is on the left and E.coli Type I signal peptidase (SCOP d1b12a_ ) is on the right. The amino acids included in the reference alignment are represented as orange sticks, helices in yellow, strands in blue.
Mayr et al. BMC Structural Biology 2007 7:50 doi:10.1186/1472-6807-7-50