Recombinant DNA Technology
Plant transformation can be obtained by

combining plant and animal cells in culture
using the E. coli bacterium to infect plant roots
shooting DNA into plant cells with a gun
infecting plants with a tobacco mosaic virus

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Recombinant DNA Technology
Knockout mice are created by

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

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