11065
While interactions of WT and variant TGF - alpha with the ErbBs all result in ErbB2 activation , they produce different biological consequences , suggesting that the various TGF - alpha precursors differentially modulate ErbB signaling .
 TGF - alpha, ErbBs, ErbB2, TGF - alpha precursors, ErbB
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 TGF - alpha, ErbBs, ErbB2, TGF - alpha precursors, ErbB