Fig. 5
From: Placing human gene families into their evolutionary context
Vomerolfactory-mediated courtship and territoriality in mouse lemurs and the phylogenetic history of vomeronasal receptor type 1 (V1R) genes in primates. A The urine of the dominant male gray mouse lemur (Microcebus murinus) often contains a distinct steroid-like compound that suppresses reproductive behavior of other males, but it must stand out among competitors to attract females. Dotted-lined arrows indicate a weaker signal among the dominant male urine signal. B Gene tree of V1Rs in primates [187, 191], including the gray mouse lemur. Black branches indicate genes belonging to the mouse lemur, while gray branches belong to other primate groups. C V1R gene tree of lemurs [187], including several species of mouse and dwarf lemurs (Cheirogaleidae). Black branches are Cheirogaleidae and gray branches are other strepsirrhine primates. Sexual selection coupled with extensive gene duplication of vomeronasal receptors may have facilitated rapid speciation in Cheirogaleidae. Silhouettes were obtained from PhyloPic