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The retinoblastoma gene product ( Rb ) is a nuclear phosphoprotein that regulates cell cycle progression .
 Rb, nuclear phosphoprotein, retinoblastoma gene product
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:
 Rb, nuclear phosphoprotein, retinoblastoma gene product