18825
Using different experimental approaches , model systems , and experimental conditions , a variety of molecular mechanisms have been identified by which signal transduction through WNT / beta - catenin and RAS interact , either in a synergistic or an antagonistic manner .
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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