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Two possible models based on the structural changes observed with Chlamydomonas dynein c (3). (A) The stalk rotates relative to the MT to pull the MT. (B) The stalk angle is constant, but the movement of the tail with respect to the head and stalk causes relative sliding of the MTs. The resulting MT movement is expected to be smaller in B, but it seems to be enough to produce a shift of ≈8 nm. Note that a longer part of the linker is exposed in the ADP·Pi state than in no-nucleotide.
