Fig. 3From: A human specific Alu DNA cassette is found flanking the genes of transcription factor AP2Alu DNA status and orientation flanking the TFAP genes in the primates. All 3 Alu elements are specific to the human and are not present in chimps or gorillas (a). The polymorphic HK1 Alu is opposite in orientation to the other 2. All 3 Alus are highly homologous with 96% identity and are potentially capable of secondary structure formation, examples shown in (b)Back to article page