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Diagram of possible interactions in the IFT particle. (A) IFT complexes A and B with kinesin-2 (in green) and cytoplasmic dynein (in red). (B) Synthetic phenotypes suggest interactions between all of the mutants with retrograde defects. (C) Noncomplementation phenotypes show more limited interactions. The fla2 mutant no longer interacts. (D) Two-copy suppression shows interactions of IFT139 and IFT144 while IFT172 shows a weak interaction with IFT144.
