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To study this element and its role in class II gene regulation further, a cDNA library was screened with oligonucleotide probes containing both the S element and the nearby J element of the human DPA gene .
 DNA: class II gene; DNA: cDNA library; DNA: S element; DNA: J element; DNA: human DPA gene
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: class II gene, cDNA library, S element, J element, human DPA gene 
Answer:
 DNA: class II gene; DNA: cDNA library; DNA: S element; DNA: J element; DNA: human DPA gene