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Model for alternate fates of the bacterial initiator tRNA. Following aminoacylation by MetRS, the formylability of the initiator tRNA by Fmt determines its entry into either initiation (by binding of the formylated species to IF2) or elongation (by binding of the unformylated species to EFTu). Partitioning of tRNAfMet between various factors (Fmt/IF2 or EFTu) determines its fate in protein synthesis.
