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Overexpression of UDG in Saos 2 cells was observed to delay growth late in G1 phase and transiently arrest these cells from progressing into the S phase .
 cell line: Saos 2 cells; protein: UDG
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: Saos 2 cells, UDG 
Answer:
 cell line: Saos 2 cells; protein: UDG