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Journal of Biological Rhythms
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S-Antigen Antibody Partially Blocks Entrainment and the Effects of Constant Light on the Circadian Rhythm of Locomotor Activity in the Adult Blow Fly, Calliphora vicina

B. Cymborowski

Department of Invertebrate Physiology, Warsaw University, Zwirki i Wigury 93, 02-089 Warszawa, Poland

S.-F. Hong

Institute of Cell, Animal and Population Biology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK

H.G. McWatters

Institute of Cell, Animal and Population Biology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK

D.S. Saunders

Institute of Cell, Animal and Population Biology, University of Edinburgh, West Mains Road, Edinburgh EH9 3JT, UK

Injection of S-antigen (arrestin) antibody into the brain of the blow fly Calliphora vicina, appeared to reduce sensitivity to the photic effects of a light:dark cycle (LD; entrainment) or continuous "bright" light (LL; arrhythmicity). In LD, a proportion of the injected flies evaded entrainment or showed delayed entrainment. In bright LL, flies continued with a free-running rhythm, which remained unchanged (as in continuous darkness) or lengthened (as in "dim" LL). These results focus attention on four groups of arrestin-positive neurons in the fly's brain as potential components of the photoreceptive system.

Key Words: circadian rhythms • Calliphora vicina • extraretinal photoreceptors • photic entrainment • S-antigen

Journal of Biological Rhythms, Vol. 11, No. 1, 68-74 (1996)
DOI: 10.1177/074873049601100107
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