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Fig. 5 | BMC Evolutionary Biology

Fig. 5

From: Serotonin-immunoreactivity in the ventral nerve cord of Pycnogonida – support for individually identifiable neurons as ancestral feature of the arthropod nervous system

Fig. 5

Comparison of SL-ir structures in the walking leg ganglia 1, 2 and 4 of the investigated pycnogonids. SLI signal shown in inverted b/w images for better contrast. Each of the depicted three walking leg ganglia has been roughly divided into a ventral and a dorsal half (upper and lower image, respectively). This facilitates intra- and inter-specific comparisons, since overlapping of separate neuron types along the dorso-ventral axis is reduced. White stars mark the DMN somata. Green dashed rectangles indicate the AMN somata. Red arrowheads and red stippled ovals highlight the ALN somata. Blue arrowheads point at the PLN somata. White arrowheads mark the VMN somata. Black arrows show the PVN somata. a-a'': P. litorale. b-b'': Meridionale sp. c-c'': C. japonicus

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