It's plural. One symbol for one fly, two for more than one.
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Kevin Cook, Ph.D. Bloomington Drosophila Stock Center
Department of Biology http://flystocks.bio.indiana.edu
Jordan Hall 142
Indiana University 812-856-1213
1001 E. Third St. 812-855-2577 (fax)
Bloomington, IN 47405-7005 kcook from bio.indiana.edu
