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Peristimulus time histogram showing the response of afferent fibers in the medial articular nerve of a rat to intraarticular injection of glutamate. A dose of 0.1 ml of a 1-nM solution of glutamate was injected into the knee joint at the time indicated by the arrow. (From Lawand, W. D. Willis and K. N. Westlund, unpublished observations).
