Fig. 2From: Spotting the enemy within: Targeted silencing of foreign DNA in mammalian genomes by the Krüppel-associated box zinc finger protein familyAn evolutionary arms race between EREs and KRAB-ZFPs. Estimated number of LTR elements [64] and KRAB-ZFPs [15] in vertebrates. The phylogenetic tree is an approximate reprint of a previously published tree [64]Back to article page