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Organization of structural elements in the MuLV dimerization domain. Major dimerization elements are indicated: PAL1 and PAL2, palindromic sequences; SL1-SL2, stem-loop domain. The minimal dimerization active sequence (MiDAS) is 170 nt; the in vitro transcript used in this work spans 331 nt. The binding site for the fluorescent DNA primers used for primer extension is represented by a backward-facing arrow.
