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We report a number of technical refinements for single and double staining with post-embedding electron microscopy for glutamate, aspartate, and gamma-aminobutyric acid. Best results were obtained with 2.5% glutaraldehyde in the fixative and by minimizing the duration of plastic polymerization and the interval between cutting and reacting. Quantitative documentation of the ability of exogenous glutamate, aspartate, and gamma-aminobutyric acid to block their immune staining is provided. Increased intensity of staining with the glutamate and aspartate antisera resulted from preincubation of glutamate antiserum with aspartate and aspartate antiserum with glutamate. To perform double staining with antisera raised in the same species, it was necessary to block antigenicity of the first antiserum; best results were obtained with hot paraformaldehyde fumes. By using a detergent instead of etching, these methods permitted the simultaneous visualization of tracers to identify neuroanatomic pathways.

Techniques to optimize post-embedding single and double staining for amino acid neurotransmitters.