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The I alpha1 promoter activates transcription of the human germ-line C alpha1 gene for IgA1 and mediates the transforming growth factor (TGF)-beta1 responsiveness of this locus.
 transforming growth factor (TGF)-beta1, human germ-line C alpha1 gene, IgA1
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:
 transforming growth factor (TGF)-beta1, human germ-line C alpha1 gene, IgA1