Often, protein to be expressed is fused with histidine and it is called as histidine tags. For their purification, matrix containing ______ is used

Q. Often, protein to be expressed is fused with histidine and it is called as histidine tags. For their purification, matrix containing ______ is used.

A. calcium ions

B. nickel ions

C. iron ions

D. fluorine ions

Answer: nickel ions