In $1983$,Eli Lilly,an American company,first prepared two $DNA$ sequences corresponding to $A$ and $B$-chains of human insulin and introduced them into the plasmids of $Escherichia$ $coli$ to produce insulin chains. Chains $A$ and $B$ were prepared separately,extracted,and combined by creating:

  • A
    Hydrogen bond
  • B
    Disulphide bond
  • C
    Covalent bond
  • D
    Peptide bond

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