Furthermore, we also showed that the number of Fgf20a producing cells is predictive of tissue outgrowth in mutants (longfin mutants) in which memory of tissue size is lost.
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Collectively, our work leads to a new paradigm for the control of positional memory during regeneration. The Fgf20a source encodes the amount of tissue removed and controls a cellular program that ensures the decay and scaled expansion of Erk gradients which in turn control tissue growth
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