Recombinant DNA Technology
Both DNA gel electrophoresis and SDS-PAGE of proteins are similar because

both techniques rely on a constant charge to mass ratio
in both cases molecules migrate to the anode
both techniques utilize the sieving properties of gels
All of these

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Recombinant DNA Technology
Knockout mice are created by

mutagenizing a mouse and selecting for mutant offspring
infecting the mouse with a retrovirus
transfecting embryonic stem cells with an altered gene sequence
creating a chimera by fusing cells from two different cell lines

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