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The afferent connections of the main and the accessory olfactory bulb formations in the rat: An experimental HRP‐study

The afferent connections of the main and accessory olfactory bulbs in the rat were examined by injecting horseradish peroxidase (HRP) into one or the other of these structures either by microelectrophoresis or by hydraulic pressure. Alternate sections were stained with newly developed HRP‐procedures using either benzidine dihydrochloride (de Olmos and Heimer, '77) or tetramethyl‐benzidine.