title: How are insect circadian rhythms controlled?
mesh_terms: D001923:Brain Chemistry; D002940:Circadian Rhythm; D005724:Ganglia; D006728:Hormones; D007313:Insecta; D009489:Neurosecretion; D009900:Optic Nerve; D009435:Synaptic Transmission
chemical_list: D006728:Hormones