Abstract
The co-localization of calretinin (CR) and parvalbumin (PV) immunoreactivity with nicotinamide adenine dinucleotide phosphate-diaphorase (ND) activity was analyzed in the Mauthner cells of the tench. Mauthner cells were ND active, and ND staining was observed in the soma, axon cap region, and axon of these neurons. CR co-localized with ND in the axon of the Mauthner cells but not in the cell body or in the dendrites, whereas PV immunoreactivity co-localized with ND in the soma, axon and dendrites. The presence of two different calcium-binding proteins in the Mauthner cells indicates that these neurons need complex calcium-buffering systems. The co-localization of these calcium-binding proteins with ND might suggests their involvement in nitric oxide-related events.
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