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We determined the genetic requirements for M . catarrhalis BBH18 growth during iron starvation using the high - throughput genome - wide screening technology genomic array footprinting ( GAF ) .
 Chemical: iron
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