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http://dx.doi.org/10.1186/1471-2148-7-118 (Publisher version)
HAN014.pdf (Publisher version), 2MB
Mayer, G., & Harzsch, S. (2007). Immunolocalization of serotonin in Onychophora argues against segmental ganglia being an ancestral feature of arthropods. BMC Evolutionary Biology, 7: 118. doi:10.1186/1471-2148-7-118.