sorry for a question non related to crystallography but I do not know where to find relevant experts.

Please, look at the attached image:

In bacterial genome two operons, e.g. OPERON 1 and OPERON 2 lie close to each other on different strands of DNA. Genes inside each operon have the same expression level and both closely related. But does neighborhood affect expression level of OPERON 1 and OPERON 2?  Is there any published work about relationship between  expression levels of closely arranged operons/genes?

Or may be someone knows about database where genes are mapped with their expression level?
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