psd95 probe can be a good neuronal marker although some cell types may escape labeling. NeuN is not perfect either
what I have is a commercial set of Stellaris Cy3 FISH RNA oligos (for single molecule detection), works best on cultures and optics must be REALLY good. You are welcome to try.
We are looking for something for use in human brain. I wonder if that would work.
it may not be worthy to try FISH with oligos with tissues; the biggest obstacle will be strong tissue autofluorescence while the real FISH signal is going to be super-faint. Long DIG-labeled probes seem a better way of approaching here and these can be made commercially or with a help from a molecular biologist. Allen brain atlas must have a sequence posted on their site for PSD95
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