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We also detected abnormally low levels of the signaling molecules T-cell receptor (TCR)-zeta , ZAP-70 and p56lck in 4 of 14 breast cancer patients , i.e., defects in T-cell signaling molecules .
 signaling molecules, T-cell signaling molecules, signaling molecules, p56lck, ZAP-70, T-cell receptor (TCR)-zeta
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:
 signaling molecules, T-cell signaling molecules, signaling molecules, p56lck, ZAP-70, T-cell receptor (TCR)-zeta