
(A) Overview of the genomic organization of OR genes located at cluster mOR37-II (gene names are according to Zhang and Firestein [2002]; mOR37 notations are given in brackets). Genes marked in bold are receptors from family 262 (Zhang and Firestein 2002) which lack the insertion of amino acids in the E3 loop.Arrows indicate the transcriptional orientations.Intergenic distances are given below in kilobases; numbers are rounded off to the nearest decimal place.(B) Distribution of the genomic loci accommodating OR genes on mouse chromosome 4.Positions are given in megabases (Mb) and chromosomal bands.The length of bars represents the number of OR genes at each locus.











