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Interestingly , calcium slowed down the hemin iron absorption rate in normal rats , MRT0 - t being significantly different in calcium - treated animals compared to untreated ones .
 Chemical: calcium; Chemical: hemin; Chemical: iron; Chemical: calcium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: calcium; Chemical: hemin; Chemical: iron; Chemical: calcium