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Leica) in an ice-cold cutting solution containing the following (in mm): 225 sucrose, 13.9 NaCl, 26.2 NaHCO 3 , 1 NaH 2 PO 4 , 1.25 glucose, 2.5 KCl, 0.1 CaCl 2 , 4.9 MgCl 2 , and 3 kynurenic acid