14467
At similar physiological intracellular Ca (2) + concentrations , local Ca (2) + releases were large and rhythmic in permeabilized sinoatrial node cells but small and random in permeabilized ventricular myocytes .
 Ca (2) +, Ca (2) +
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Ca (2) +, Ca (2) +