(A) Integrated genetic/physical map of chromosome 17 encompassing the flo locus. Recombinants from 5200 meioses narrowed the genetic interval containing flo to a region spanned by 3 BACs (blue, green and orange lines) and nine genes (red). Fine mapping of the last two flanking recombinants defined a 50kb region (grey) containing a single gene, elys. The nucleotide sequences of elys cDNAs from floti262 and flos871embryos contain a C→T transversion (B) and a T→A transversion (C), respectively; both create a premature stop codon. (D) Schematic representation of zebrafish Elys indicating three nuclear export sequences (NES), two WD40 protein binding domains (WD), an AT-hook DNA binding domain and two nuclear localization signals (NLS). Arrows indicate premature stop codons encoded by the flos871 and floti262c alleles at codons 461 and 1319, respectively.