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We have defined the development of the serotonergic and dopaminergic components of the central nervous system in the early Spisula solidissima (surf clam) embryo using HPLC and immunocytochemistry. HPLC analysis reveals norepinephrine, dopamine, and serotonin are present at 24 h post-fertilization. Immunocytochemistry shows that the serotonergic nervous system emerges during the late trochophore stage...
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