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Induction of a new oral primordium by juxtaposition of narrow and wide striped cortical regions. In this experiment, a region of the cortex containing narrow stripes (closely spaced ciliary rows), but not including the locus of stripe contrast itself, is removed from one cell and grafted onto another in a region containing wider stripes. When the graft recipient cell is induced to regenerate, the new contrast zone supports the formation of a second oral primordium.
