20131
These techniques , which are useful for in vitro studies , will be particularly advantageous where investigators seek deeper understanding of diseases where mismetabolism of metals , either physiological important ( i . e . Cu , Zn ) or outright toxic ( i . e . Pb ) , underlies pathogenesis .
 Chemical: Cu; Chemical: Zn; Chemical: Pb
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: Cu; Chemical: Zn; Chemical: Pb