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Adult humans have about 25 trillion red blood cells ( RBCs ) , and each second we recycle about 5 million RBCs by erythrophagocytosis ( EP ) in macrophages of the reticuloendothelial system .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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