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In contrast, we found that AR can initiate apoptosis in S49 cells after treatment with 5 alpha-dihydrotestosterone , despite its relative inability to induce high level expression of MMTV .
 cell line: S49 cells; protein: AR
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: S49 cells, AR 
Answer:
 cell line: S49 cells; protein: AR