The complex structure of 7E SDs. Each 7E SD is shown with its constituent repeat-element structure (colored bars) around 7E gene(s) (black bars). The arrows, which are not drawn to scale, represent the 5′ to 3′ transcriptional direction of each 7E gene; black and red arrows designate members of clade A and clade B, respectively. The labels to the left of each 7E SD give the chromosome and position in the UCSC August 2001 assembly at which the SD begins. The top line shows the putative ancestral locus on human chromosome 19 and includes non-SD material. The brackets a–d, a‘, and b‘ denote features discussed in the text. The four SDs that include unfinished sequence are marked with asterisks.
