“…Biogenic amines in the central nervous system, especially dopamine, octopamine and serotonin, are candidates to respond to variations in queen pheromone. By functioning as neurotransmitters, neuromodulators and neurohormones (Bicker and Menzel, 1989;Roeder, 1994;Osborne, 1996) the biogenic amines modulate a diversity of physiological and behavioral functions in honey bees, such as learning and olfactory memory (Bicker and Menzel, 1989;Erber et al, 1993;Menzel and Müller, 1996;Blenau et al, 1998), recruitment behavior (Bozic and Woodring, 1998), age-related division of labor (Taylor et al, 1992;Robinson, 1999, 2001;Wagener-Hulme et al, 1999), nestmate recognition , foraging behavior (Barron et al, 2002), and changes in morphological development (Taylor et al, 1992). Also, in honey bees, as well as in the bumble bee Bombus terrestris L., high levels of dopamine in the brain correlate with physiologically active ovaries and fully developed oocytes (Harris and Woodring, 1995;Bloch et al, 2000;Sasaki and Nagao, 2001).…”