1942
Since both fast and slow muscles completely regenerated only from their own myogenic stem cells and were innervated by the same nerve and later activated by the same tonic pattern of impulses , these results demonstrated that the mechanism causing incapacity of regenerating fast muscles to increase their extrajunctional ColQ expression upon tonic activation is encoded in their satellite cells , which in this respect differ from those in the slow muscles .
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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