Abstract
Initiation factor IF3 activity (defined by complementation with IF1 and IF2) can be separated in subfractions differing by their relative activity for various mRNA templates. In many cases, it can be shown that the template specificity of these subfractions results from the presence of other protein factors, having no IF3 activity by themselves, but which interfere with IF3 messenger selection activity. Purified IF3 is active for both MS2 and T4 mRNA and interference factors are defined and assayed by their mRNA and cistron-specific stimulatory or inhibitory effects on this standard IF3 activity.
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