Fig. 2. Weight of wild type (WT) and Xaf1o mutants at 1-2 weeks of age. To standardize between litters, the weight of each pup obtained from Xaf1/⁺ intercrosses was expressed as the ratio of its weight relative to the average weight of the WT pups from the same litter. Ratios were then grouped within classes differing by 0.1 increment (y-axis). The number of Xaf1o and WT animals in each class is indicated on the top of the bars.