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A model of Hh pathway evolution. (A) A single-celled flagellated eukaryote, containing homologs of Hh pathway members, may have served as the common ancestor. (B) As the pathway diverged, some organisms dispensed with the necessity of cilia for transduction. (C) Among those that retained the requirement of cilia, additional divergence resulted in a lineage that continues to utilize motile cilia and (D) another that has lost ciliary motility in Hh-receiving cells.
