10980
The maturation of lung and alveolar epithelium is delayed in the mutant , as indicated by narrowed air spaces , thickened interstitial septa , and increased glycogen content in the lungs of Stk40 ( - / - ) mice .
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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