6904
With subsequent enzymatic digestion of the silk to concentrate the sequestered metals , options can be envisaged to use these new chimeric protein systems in environmental engineering , including to remediate environments contaminated by uranium .
 Chemical: uranium
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: uranium