2308
Confocal microscopy was used to measure intracellular free - calcium concentrations ( [ Ca ( 2 + ) ] ( i ) ) in isolated myocytes .
 Chemical: calcium; Chemical: Ca
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: calcium; Chemical: Ca