Schematic representation of the gWD and snWD mutants. A/Parental active het-R allele and mutants from the RV collection. B/Parental active het-E allele and mutants from the CE collection. Nucleic sequence WD40 repeat units sharing the same colour are identical. Repeat units represented in white differ by a single nucleotide from their parental repeat unit (indicated by a number). Repeat units represented in black differ by more than one nucleotide from any parental units. Stop codons are indicated by arrowheads. Incomplete boxes of the e2 mutant delineate a 21 bp in frame deletion.