Most frequent mutations, with predicted effects on genes, detected in the YKOC (top 200) and their distribution among different source laboratories. (a) Left: the mutation is indicated by its predicted effect, and the background indicates whether it is a mutation in a gene with degenerate repeats (grey), a mutation coming from founder effect (yellow), or a frequently mutated site (green); boldface indicates homozygous mutation. Centre: heatmap of the distribution of the most frequent mutations by laboratory in which the strain carrying that mutation was produced (100% indicates that all the strains with a certain mutation were generated in the same laboratory). Right: number of strains carrying the mutation. (b) Not all strains derived from each laboratory share founder mutations: as in (a), but a value of 100% in the heatmap indicates that all the strains generated by a certain laboratory have that mutation.