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Mouse hippocampal synaptosomes were preloaded with [ ( 3 ) H ] D - gamma - aminobutyric acid ( [ ( 3 ) H ] GABA ) and then exposed in superfusion to 12 mM KCl .
 Chemical: [ ( 3 ) H ] D - gamma - aminobutyric acid; Chemical: [ ( 3 ) H ] GABA; Chemical: KCl
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: [ ( 3 ) H ] D - gamma - aminobutyric acid; Chemical: [ ( 3 ) H ] GABA; Chemical: KCl