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The olfactory system meets niche- and species-specific demands by an accelerated evolution of its odorant receptor repertoires. In this review, we describe evolutionary processes that have shaped olfactory and vomeronasal receptor gene families in vertebrate genomes. We emphasize three important periods in the evolution of the olfactory system evident by comparative genomics: the adaptation to land...
The mammalian olfactory system utilizes three large receptor families: the olfactory receptors (ORs) of the main nose and the vomeronasal type-1 and type-2 receptor genes (V1Rs and V2Rs) of the vomeronasal organ. We find that these loci are among the most long interspersed nuclear element (LINE)-dense regions of mammalian genomes. We investigate two evolutionary models to account for this cohabitation...
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