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Comparison of human and murine blk sequences indicated that they share 86 % amino acid identity , the most conserved region being the catalytic domain ( 93 % identity ) .
 human and murine blk sequences
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 human and murine blk sequences