7585
In summary , p56 ( lck ) activity stimulates G1 / S transition in immature thymoblasts and maintains cell viability via transduction of constitutive activation signals downstream to components of the Ras / Raf / MAPK pathway .
 p56, lck, Ras, Raf, MAPK
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 p56, lck, Ras, Raf, MAPK