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Here we have investigated the transcriptional regulation of the gamma chain gene by analyzing the 2.5-kilobase sequence upstream of the transcription start site .
 DNA: 2.5-kilobase sequence; DNA: transcription start site; protein: gamma chain
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: 2.5-kilobase sequence, transcription start site, gamma chain 
Answer:
 DNA: 2.5-kilobase sequence; DNA: transcription start site; protein: gamma chain