13887
Supernatants from these cultures were assayed for secreted TGF-alpha and TGF-beta1 using TGF -specific ELISAs .
 TGF, TGF-beta1, TGF-alpha
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 TGF, TGF-beta1, TGF-alpha