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We investigated the relationship between muscular bioaccumulation levels of metals ( Hg , Cd , Pb , Cu , Zn , Ni , Cr , As and Se ) , PCBs and organochlorine pesticides ( DDTs ) , the health status ( condition factor and lipid reserves ) and the associated transcriptional response in liver and gill tissues for genes involved in metal detoxification ( metallothionein , MT ) and oxidative metabolism ( cytochrome P4501A , CYP1A ) of xenobiotic compounds .
 Chemical: Hg; Chemical: Cd; Chemical: Pb; Chemical: Cu; Chemical: Zn; Chemical: Ni; Chemical: Cr; Chemical: As; Chemical: Se; Chemical: PCBs; Chemical: DDTs
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: Hg; Chemical: Cd; Chemical: Pb; Chemical: Cu; Chemical: Zn; Chemical: Ni; Chemical: Cr; Chemical: As; Chemical: Se; Chemical: PCBs; Chemical: DDTs