Subject: wgCX1 Dear Flybase, Although the so-called allele wgCX1 was isolated by failure to complement wg1 (see EMBO J 6:1765-1773 ), the phenotype associated with wgCX1/wg1 is weak and poorly penetrant, and wgCX1 fully complements amorphic wg alleles. These data make allelism to wg uncertain. Since the so-called wgCX1 chromosome contains a deletion that uncovers arrow (Df(2R)CX1, 49C1-4;50C23-D2 see Hu et al Genetics 141:607-617 ), an alternative explanation of intergenic non-complementation between arrow and wg1 is plausible. sincerely Nick Baker \-- Nicholas E. Baker PhD Professor of Molecular Genetics Department of Molecular Genetics Albert Einstein College of Medicine 1300 Morris Park Avenue Bronx NY 10461 USA