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Antagonist sensitivity identifies pathway involvement, not necessarily direct theanine binding.\nexposure: Local brain theanine administration; glycine and AMPA antagonists\nevidence_span: {\"source_cache\": \"artifacts/theanine-research/18196445.abstract.txt\", \"locator\": \"Primary indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"59fdaf94d59c2f4b2981c29cd2981c043351aae1299a59a19e29979076957839\", \"start_char\": 0, \"end_char\": 1118, \"text_sha256\": \"59fdaf94d59c2f4b2981c29cd2981c043351aae1299a59a19e29979076957839\"}\n[theanine-p18196445] Theanine, gamma-glutamylethylamide, a unique amino acid in tea leaves, modulates neurotransmitter concentrations in the brain striatum interstitium in conscious rats. 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