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Initiation of DNA replication requires the function of MCM gene products , which participate in ensuring that DNA replication occurs only once in the cell cycle .
 protein: MCM gene products
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: MCM gene products 
Answer:
 protein: MCM gene products