Surface tension lowering substance of the eustachian tube.
D000818:Animals; D004285:Dogs; D005064:Eustachian Tube / Q000032:analysis / Q000502:physiology*; D006801:Humans; D010033:Otitis Media / Q000209:etiology; D011663:Pulmonary Surfactants / Q000502:physiology; D013499:Surface Properties; D013500:Surface Tension; D013501:Surface-Active Agents / Q000302:isolation & purification* / Q000502:physiology
D011663:Pulmonary Surfactants; D013501:Surface-Active Agents