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In both cases , at the end of exposure the same level of blood carboxyhemoglobin ( COHb ) ( about 50 % ) was reached .
 GENE: blood carboxyhemoglobin; GENE: COHb
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: blood carboxyhemoglobin; GENE: COHb