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The retinoblastoma gene product ( Rb ) is a nuclear phosphoprotein that regulates cell cycle progression .
 protein: Rb; protein: nuclear phosphoprotein; protein: retinoblastoma gene product
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: Rb, nuclear phosphoprotein, retinoblastoma gene product 
Answer:
 protein: Rb; protein: nuclear phosphoprotein; protein: retinoblastoma gene product