en.wikipedia.org
en.wikipedia.org
bio.libretexts.org
sciencedirect.com
bio.libretexts.org
microscopemaster.com
MicroscopeMaster
https://www.microscopemaster.com › proteobacteria.html
link.springer.com
biologyonline.com
psu.pb.unizin.org
The Pennsylvania State University
https://psu.pb.unizin.org › microb201 › chapter › proteobacteria
link.springer.com
simple.wikipedia.org
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