I am looking for the spectrophotometric assay.
Here are some ELISA kits for GABA:
http://www.uscnk.com/uscn/ELISA-Kit-for-Human-Gamma-Aminobutyric-Acid-GABA-277.htm
https://www.abnova.com/protocol_pdf/KA1919.pdf
https://www.lsbio.com/elisakits/gaba-gamma-aminobutyric-acid-elisa-kit-competitive-eia-ls-f4121/4121
And here is a fluorescence-based assay:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3923810/
thank you so much
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