Figure 4

Olfactory and vomeronasal receptor clusters in the mouse genome. a) Chromosomal distribution of mouse OR and V1R genes. OR genes are on most chromosomes, with large clusters on chromosome 2, 7, 9, 11 containing the majority of OR genes. The major V1R gene clusters are located on chromosome 6, 7, 13 and 17. Figure adapted from [10], Copyright (2003), with permission from Elsevier. b) Schematic map of a V1R cluster located on mouse chromosome 6 (chromosomal location indicated by an open rectangle on ideograms shown in Fig. 4a) showing intact V1R genes (green flags), V1R pseudogenes (red flags), and flanking non-V1R genes (gray flags). LINE1 retrotransposon populations are indicated by vertical black lines below the map (as shown in the UCSC Genome Browser: http://genome.ucsc.edu). The density of LINE1 populations is much higher within the V1R cluster than in surrounding flanking regions.