core: 2 alpha-helices and 5-stranded antiparallel sheet: order 21543; 3 layers: alpha/beta/alpha
Sensory domain-like (103190)
alpha(2)-beta(2)-alpha(2)-beta(3); possibly related to the PAS domain Superfamily
PfamB 021678
Pfam 09308; two-domain arrangement similar to the YkuI C-terminal domain-like