Structures of GAIN-B, ZU5 and Nup98 C-terminal domain. GAIN domain subdomain B in latrophilin-1, ZU5 domains in ankyrin-1, UNC5B and ZO-1 and Nup98 C-terminal domain are superimposed and rendered in cartoon by PyMOL. Core strands are colored generally from blue to red with paired strands in a hairpin colored identically. The side chains of autoproteolytic sites in Nup98 and GAIN are shown in sticks. Note that the serine in Nup98 structure is missing.