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Superparamagnetic iron oxide nanoparticles ( SPIONs ) show a great promise for a wide specter of bioapplications , due to their characteristic magnetic properties exhibited only in the presence of magnetic field .
 Chemical: iron oxide
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 oxide