How to quantify intensity of fluorescence on ImageJ when cells are overlapping?

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So I've been experimenting on HEK293T cells and they seem to have been growing on top of each other (to an extent) and now on ImageJ some of the really bright hoerscht signal is overlapping and the software only picks it up as one cell. I am new to analysing with ImageJ so any help would be great! The end aim in to normalise total FITC signal to total hoerscht.

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