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This is the first demonstration that lithium can alter gene expression of Tcf-responsive genes , and points to a difference in regulation of Wnt signaling between fibroblasts and lymphocytes .
 lymphocytes, fibroblasts, Tcf-responsive genes
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:
 lymphocytes, fibroblasts, Tcf-responsive genes