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In the conscious animals the increase reached statistical significance when the animals were exposed to 12 % oxygen in nitrogen , which produced a fall in arterial PaO2 of 44 . 7 + / - 5 . 0 % .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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