Figure 4.
Gene clustering on maize chromosomes. Each chromosome has been divided into 2-μm intervals except where chromosome arm lengths are not evenly divisible by two. In those cases, the intervals around the centromeres are somewhat different from 2 μm. The color of each segment corresponds to its gene density ratio (observed gene density divided by expected average gene density for that chromosome), as provided in the key. The heterochromatin boundaries on either side of each centromere are indicated by brackets to the left of each chromosome.
