Comparison of positions of SNPs anchored on four genetic maps and on the draft sequence assembly of chromosome 7. Finished clones harboring newly discovered polymorphisms are anchored on a genetic map by content of previously mapped markers. Clone positions on meiotic maps (heat shock (HS) and Boston MGH), radiation hybrid maps (T51 and LN54), and the Zv6 draft physical sequence assembly are provided. Where a clone is common to two adjacent maps, a connecting line indicates corresponding positions. The asterisk indicates the position of BAC zC258D20, linked to the trilobite locus.