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To test this hypothesis, light-chain gene structure was examined in pre-B cells transformed by temperature-sensitive mutants of the Abelson virus and in derivatives that survive at the nonpermissive temperature because they express a human BCL-2 gene .
 cell line: pre-B cells; DNA: human BCL-2 gene; DNA: light-chain gene structure
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: pre-B cells, human BCL-2 gene, light-chain gene structure 
Answer:
 cell line: pre-B cells; DNA: human BCL-2 gene; DNA: light-chain gene structure