title: Sesquiterpene progenitor, germacrene A: an alarm pheromone in aphids.
abstract: Germacrene A, the elusive biogenetic "parent" of many sesquiterpenes, has been isolated from the spotted alfalfa aphid and identified as a new intrageneric aphid alarm pheromone.
mesh_terms: D000818:Animals; D001042:Aphids / Q000032:analysis / Q000502:physiology*; D005239:Fear / Q000502:physiology*; D009682:Magnetic Resonance Spectroscopy; D010675:Pheromones / Q000302:isolation & purification / Q000502:physiology; D012717:Sesquiterpenes / Q000302:isolation & purification; D013055:Spectrophotometry, Infrared
chemical_list: D010675:Pheromones; D012717:Sesquiterpenes