14463
Ca (2) + - dependent phosphorylation of Ca (2) + cycling proteins generates robust rhythmic local Ca (2) + releases in cardiac pacemaker cells .
 Ca (2) +, 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) +, Ca (2) +