A spinning reel has a reel body and a rotor. The rotor has a base pivoted to the base, a first arm pivoted to an end of the base, a second arm pivoted to the other end of the base, an arc connected between the first arm and the second arm, a guiding block disposed between the first arm and the arc, and a wheel disposed between the guiding block and the first arm. The guiding block has a cone portion connected to the arc and a base portion connected to the wheel. The cone portion has a hole into which the arc is inserted and two tip ends located at opposite sides of the hole.

 
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> Method for generating hypermutable organisms

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