24598
Synaptotagmin - 1 , a vesicular protein interacting with membranes upon low - affinity Ca ( 2 + ) - binding , plays a major role in excitation - release coupling , by synchronizing calcium entry with fast neurotransmitter release .
 Chemical: Ca ( 2 + ); Chemical: calcium
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: calcium