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Most of these cells have rearranged their heavy-chain locus but not their light chain genes , suggesting that an active v-abl protein interferes with this differentiation step.
 light chain genes, heavy-chain locus, v-abl protein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 light chain genes, heavy-chain locus, v-abl protein