{"gt_parse": {"text_sequence": "gic system was described in th e airway epithelium. The system is activat ed by exposure to allergens and may participate in th e me chanisms of asthma. GA BAergic system s have also bee n found in the testis a nd in the eye le ns.Structure an d conformati on.GABA is found mostly as a zwitt erion . Its confor mation depend s on its en vironment. In the gas phase a highly fo lded conformatio n is strongly fav ored due to t he electrostat ic attraction betw een t he tw o fu nctio nal gr oups. Th e sta bilizati on is a bo ut 50 k cal/mol ac cording to quantum che mistry calculations"}}