11060
Proteins containing BIR are known as inhibitor of apoptosis proteins ( IAPs ) , or BIR-containing proteins ( BIRPs or BIRCs ) , and include BIRC1 ( NAIP ) , BIRC2 ( cIAP1 ) , BIRC3 ( cIAP2 ) , BIRC4 ( xIAP ) , BIRC5 ( survivin ) and BIRC6 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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