21844
Whereas gap junction channels connect the cytoplasm of contacting cells and coordinate electric and metabolic activities , hemichannels communicate intra - and extra - cellular compartments and serve as diffusional pathways for ions and small molecules .
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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:
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