Fig. 3.

Frequency distributions of dropping weights pooled from three wild-type controls (A) and four homozygous mutants (B). Age in weeks at the time of collection is indicated above, and the total counts of pellets collected during the last two consecutive days are shown below. The size bins set to 0.5-mg increments are indicated on the left. The heat maps reflect the relative frequency of pellet counts in a given lot; the most frequent values are boxed for better visibility.