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Results of our study suggest that Pb forms occurring in the P . stratiotes tissues are absorbed through the gastrointestinal tract to a greater extent than Pb from lead acetate .
 Chemical: Pb; Chemical: Pb; Chemical: lead acetate
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: Pb; Chemical: Pb; Chemical: lead acetate