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Evidence that oral regeneration in Stentor can be triggered by the loss of a single oral apparatus. One of the strengths of Stentor as a model system is the ability to graft cells and cell fragments together. In the experiment depicted here, two cells are grafted together to form a doublet cell, which has two oral apparatuses. If one OA is then surgically removed, both of the fused cells form oral primordia (red) such that one half of the doublet regenerates and the other reorganizes.
