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Abnormal intrapulmonary shunting ( IPS ) , which was proved in 4 cases by whole - body radionuclide scanning with 99mTc - MAA , is suggested as the major cause of cyanosis in liver cirrhosis .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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