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Geometry of V. carteri and experimental setup. (A) The beating flagella, two per somatic cell (Inset), create a fluid flow from the anterior to the posterior, with a slight azimuthal component that rotates Volvox about its posterior-anterior axis at angular frequency ωr. (Scale bar: 100 μm.) (B) Studies of the flagellar photoresponse utilize light sent down an optical fiber.
