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In the present study , the potential influences of prey composition on the trophic transfer , accumulation , subcellular distribution and metallothionein induction of six metals ( Ag , As , Cd , Cu , Pb and Zn ) in a predator Nassarius siquijorensis were investigated .
 Chemical: Ag; Chemical: As; Chemical: Cd; Chemical: Cu; Chemical: Pb; Chemical: Zn
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: Ag; Chemical: As; Chemical: Cd; Chemical: Cu; Chemical: Pb; Chemical: Zn