1. Bee Research Laboratory; Beltsville Agricultural Research Center - East; U.S. Department of Agriculture; Bldg 306 10300 Baltimore Ave. Beltsville MD 20705 USA
2. Electron and Confocal Microscopy Unit; Beltsville Agricultural Research Center - West; U.S. Department of Agriculture; Bldg 012 10300 Baltimore Ave. Beltsville MD 20705 USA
3. Laboratory of Zoophysiology; Faculty of Science; Ghent University; Ghent Belgium