7333
Examination of the expression levels and gating characteristics of seven additional mutants ( R75A , R75D , R75E , R75H , R75K , R75L , and R75V ) at this position suggest that the positive charge at position 75 in Cx32 is required for normal channel function but not for gap junction assembly .
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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