highly significantp=5.6 × 10 −4
Interestingly, histone concentrations, and thus cellularity, increased from the inner to the outer compartments of the disc, and showed a highly significant decrease in aged discs compared to young discs across all compartments ( Figure 1J , Wilcoxon p=5.6 × 10 −4 ; Figure 1—figure supplement 4B ).