Fig. 1

Cryo-section of the cerebropleural (CPG) and pedal (PG) ganglia of the adult scallop Azumapecten farreri immunostained with FMRFamide (green), serotonin (magenta), and acetylated α-tubulin (white) antibodies with DAPI (blue). a Tissue section view of the CPG connected with PG by cerebropleuro-pedal connective (cppc). The external part of the ganglia includes the neuronal somata (cortex) of ganglia; the inner part of ganglia is intertwined with neurites forming neuropil. Inserts: b–e1 Magnified parts of the CPG. f–i1 The neuropil and cortex of the PG. Scale bars: a = 100 μm; b, c, d, e = 30 μm; b1, c1, d1, e1 = 7 μm; f, h, g, i = 50 μm; f1, h1, g1, i1 = 18 μm