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Saturation mutagenesis research, which began in the 1970s, to investigate mutations in developmental control genes, resulted in the identification of virtually all the susceptible genes that are important developmentally (Nusslein-Volhard and Weischaus 1980).
Now another segment has been identified; it is similar in developmental control genes of an unsegmented worm called a nematode and in those of a fruit fly.
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