10782
A beta interacts with both the iron center and the porphyrin ring of heme : mechanism of heme ' s action on A beta aggregation and disaggregation .
 Chemical: iron; Chemical: porphyrin; Chemical: heme; 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: iron; Chemical: porphyrin; Chemical: heme; Chemical: heme