23062
omega - Agatoxin - IVA is a well known P / Q - type Ca ( 2 + ) channel blocker and has been shown to affect presynaptic Ca ( 2 + ) currents as well postsynaptic potentials .
 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 + )