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The genome of α-viruses like Semliki Forest virus (SFV) and Sindbis virus consists of a single-stranded molecule of Mr 4-4.5 X l0⁶. The genes for the non-structural proteins are located near 5' (capped) terminus of this 42 S RNA, whereas information for the structural proteins, one capsid three envelope proteins, is found near the 3’ .
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Steeg et al. (1979) studied this question.
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