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Protein structures of Fos proteins used in this study. ∗, A single amino acid exchange from c-Fos; ▤, the leucine zipper motif; ▨, a frame-shift mutation generated by a deletion present in v-Fos of FBJ-MSV. The mutant of v-Fos (FBJ), CD3, terminates at amino acid residue 202, whereas the wild type is composed of 381 amino acid residues.
