Hello. I plan to experiment using mouse brains with fluorescence in situ hybridization (FISH). In particular, I want to measure the expression level of some genes in specific neurons labeled with retrograde AAV (e.g., retroAAV-hSyn-EGFP) or retrograde tracer (e.g., CTB-488 or Fast Blue). Is the fluorescent signal of virally expressed fluorescent protein or dye is intact after FISH? If the signal is fine, which one is better? If not, Are additional processes such as FISH or IHC for fluorescent protein or IHC for dye molecule needed? I am looking forward to hearing from you soon.