The "SciH" cluster
This cluster has at its core two hypothetical proteins that occur in
Planctomycetes (fig|243090.1.peg.5361:
Pirellula sp. 1) and numerous proteobacteria. Here is a pinned
region depicting the situation.
The two genes have been called impB and sciH in many
cases, although I have not located the origin of these designations.
There are discussions of the imp operon and someone clearly
thinks about an sci operon. There are some suggestions that
these relate to pathogenicity. I am basically clueless on this one.