title: Perspective.
abstract: This issue of Molecular Ecology includes an exciting article by Aubin-Horth et al. in which they examine behaviour, hormone levels, and gene expression in dominant and subordinate male and female cichlid fishes of the African species Neolamprologus pulcher. Their fascinating experiments take us one important step closer to an understanding of one of life's persistent mysteries: why males differ from females and how such differences develop and evolve.
authors: Department of Biology, Indiana University, Bloomington, IN 47405, USA.
authors: Ellen D
authors: ED
authors: Ketterson
mesh_terms: D000818:Animals; D023681:Cichlids / Q000378:metabolism / Q000502:physiology*; D005260:Female; D005786:Gene Expression Regulation; D006608:Hierarchy, Social; D006728:Hormones / Q000378:metabolism*; D008297:Male; D012727:Sex Characteristics
chemical_list: D006728:Hormones