title: Eighth Adolf Butenandt lecture. Why are so many hormones steroids?
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005260:Female; D006728:Hormones / Q000502:physiology; D006801:Humans; D008297:Male; D008958:Models, Molecular; D008968:Molecular Conformation; D010937:Plant Growth Regulators / Q000502:physiology; D011956:Receptors, Cell Surface / Q000502:physiology; D013045:Species Specificity; D013256:Steroids / Q000502:physiology; D013329:Structure-Activity Relationship
chemical_list: D006728:Hormones; D010937:Plant Growth Regulators; D011956:Receptors, Cell Surface; D013256:Steroids