9990
Therefore , such mutations in the pore region of SK channels show that the three - dimensional structure of the SK tetramers can be disorganized in the outer pore region leading to reduced interaction of apamin with its target .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None