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We tested the effects of a series of synthetic oligonucleotides (hybridons) complementary to the 5' noncoding and coding regions of rabbit beta-globin mRNA on endogenous protein synthesis in a rabbit reticulocyte cell-free translation system. With highly purified hybridons inhibition was completely specific for beta-globin. The sites most sensitive to inhibition are the beginning of the 5' noncoding region and a sequence including the initiation codon and several upstream bases. The region between these was relatively insensitive to inhibition. The sites of maximum sensitivity coincide with known protein binding sites, suggesting that hybridons exert their effects in part by blocking the binding of proteins required for translation. Their effectiveness seems related to the ease with which they are displaced by ribosomes.
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