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The little weed Arabidopsis thaliana is the best friend of plant geneticists.
Superman and Clark Kent - Superman mutants have extra stamens (male genitals) in their flowers. After it, another similar mutation was found, only more whimpish. It was named clark kent. Later, however, it turned out that clark kent is only another form of superman.
Kryptonite - Kryptonite mutation suppresses the function of superman (above).