24596
A low - affinity Ca ( 2 + ) / H ( + ) - antiport was described in the membrane of mammalian brain synaptic vesicles .
 Chemical: Ca ( 2 + ); Chemical: H ( + )
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: Ca ( 2 + ); Chemical: H ( + )