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Hematopoietic growth factors have already had an enormous impact on transfusion practice by eliminating or reducing the need for red blood cell transfusions in a variety of anemic states characterized by an absolute or relative decrease in erythropoietin .
 Hematopoietic growth factors, erythropoietin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Hematopoietic growth factors, erythropoietin