4268
In contrast , dominant myotonias sensitive to potassium are caused by point mutations in SCN4A on chromosome 17q , the gene for the alpha subunit of the adult skeletal muscle sodium channel .
 Disease: dominant myotonias
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
 Entities: dominant myotonias 
Answer:
 Disease: dominant myotonias