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#Question id: 18697


Knockout mice are created by

#Part-B Specialized Branches in Biotechnology
  1. mutagenizing a mouse and selecting for mutant offspring
  2. creating a chimera by fusing cells from two different cell lines
  3. infecting the mouse with a retrovirus
  4. transfecting embryonic stem cells with an altered gene sequence

Answer:- Option(s): 4


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