Genotypes uniquely identify mouse strains and cell lines. A) Density plots of alignment scores for all pairwise comparisons between reference samples (purple) and between cell lines (green), and maximum alignment scores for each cell line compared to all reference samples (orange). Alignment scores range from 0.0 (no genotypes in common) to 1.0 (genetically identical). High identity in some pairwise cell line comparisons is due to inclusion of replicates. B) Heat map of all comparisons between cell lines (columns) and reference samples (rows). Columns are ordered based on clustering of cell lines by genotype, as shown in the dendrogram at the top of the plot (branch lengths are arbitrary).