Physical location of markers on the chromosome 7 Genethon genetic map. A summary of the physical mapping information about the 272 markers comprising the chromosome 7 Genethon genetic map (Weissenbach et al. 1992; Gyapay et al. 1994; Dib et al. 1996; seehttp://www.genethon.fr/genethon_en.html) is provided in a table on the World Wide Web (see Table 2). This electronic supplement also includes detailed explanations about the information contained in the table. Shown here is a small, representative sample from the first portion of the table, which includes the Genethon genetic markers present in the YAC contig featured in Figs. 4 and 5.