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Since myoglobin is co - extracted with the hemoglobin , the 2 heme pigments are separated in one portion of the extract by precipitating the hemoglobin in an 85 % ( NH4 ) 2SO4 solution .
 myoglobin, hemoglobin, hemoglobin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 myoglobin, hemoglobin, hemoglobin