18822
Signaling through the WNT / beta - catenin and the RAS ( rat sarcoma ) / MAPK ( mitogen - activated protein kinase ) pathways plays a key role in the regulation of various physiological cellular processes including proliferation , differentiation , and cell death .
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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