12703
These motifs are regulatory sequences within the so-called AU-rich elements ( AREs ) often found in 3' untranslated regions of genes such as cytokines , proto-oncogenes , and transcription factors .
 DNA: AU-rich elements; protein: transcription factors; DNA: 3' untranslated regions; DNA: regulatory sequences; DNA: proto-oncogenes; DNA: AREs; protein: cytokines
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: AU-rich elements, transcription factors, 3' untranslated regions, regulatory sequences, proto-oncogenes, AREs, cytokines 
Answer:
 DNA: AU-rich elements; protein: transcription factors; DNA: 3' untranslated regions; DNA: regulatory sequences; DNA: proto-oncogenes; DNA: AREs; protein: cytokines