Copper sensors in root cells

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Copper sensors in root cells

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Dear all,
I'm looking for a sensor or any molecule that could detect Copper inside
the vacuoles of plant root cells. I'm not interesting in the measurement
of the levels, so anything that could detect it would be fine, either
fluorescent or not. Another thing is that the tissue is plant so I don't
know exactly how well  the actual sensors for mammalian cells function
under this environment.
As always, any help is welcome.
Thank you very much in advance.

Juan Luis Ribas

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Juan Luis Ribas
Servicio de Microscopía
Centro de Investigación, Tecnología e Innovación
Universidad de Sevilla
Spain