10981
The reduction in levels of T1 - alpha , SP - B , and SP - C indicates delayed maturation of both type I and type II respiratory epithelial cells in Stk40 ( - / - ) lungs .
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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