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Thus, TAL1 activation in these patients may result from subtle alterations in cis-acting regulatory sequences (affecting expression of a single TAL1 allele ) or changes in trans-acting factors that control TAL1 transcription (affecting expression of both TAL1 alleles ).
 TAL1 alleles, TAL1, cis-acting regulatory sequences, TAL1, TAL1, TAL1, single TAL1 allele
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:
 TAL1 alleles, TAL1, cis-acting regulatory sequences, TAL1, TAL1, TAL1, single TAL1 allele