Figure 25: Distribution of various LINE cohorts as a function of local GC content.

The divergence levels and ages of the cohorts are shown in the key. (The divergence levels were measured for the 3′ UTR of the LINE1 element only, which is best characterized evolutionarily. This region contains almost no CpG sites, and thus 1% divergence level corresponds to a much longer time than for CpG-rich Alu copies).