I want to measure cytoplasmic ph, in E.coli, under several conditions in-vivo. To this end I would like to use cells expressing a plasmid harboring PH-sensitive GFP variant.

Does anyone have a plasmid like that and is willing to send it to my lab?

alternatively, can anyone please point me to a plasmid repository (other than 'addgene') that might have something like that in stock?

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