10803
The His - tagged TAT - SOD fusion protein was expressed in E . coli using IPTG induction and purified using FMSN - Ni - NTA .
 Chemical: Ni
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: Ni