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Here , we show that the mammalian homolog of HRG1 , a transmembrane heme permease in C . elegans , is essential for macrophage iron homeostasis and transports heme from the phagolysosome to the cytoplasm during EP .
 Chemical: heme; Chemical: iron; Chemical: heme
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: heme; Chemical: iron; Chemical: heme