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In the present study , human B lymphoblastoid cells were exposed to potassium dichromate and / or nickel chloride for 24h or 48h .
 Chemical: potassium dichromate; Chemical: nickel chloride
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: potassium dichromate; Chemical: nickel chloride