Cryptic Bacterial Species

Fred Cohan fcohan at
Mon Nov 6 18:08:28 EST 1995

Does anyone know of pairs of bacterial species that are clearly 
different in their ecological niches, but are indistinguishable by DNA 
sequence data?  I would be very grateful for any help you can offer.  

Fred Cohan
Department of Biology
Wesleyan University
Middletown, CT  06459-0170

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