This work was supported by funding from Fundacao para a Ciencia e Tecnologia [SFRH/BD/62126/2009, PTDC/BEX-BID/1176/2012]; and Agence Nationale de la Recherche [ANR-11-BSV5-0021].; Caudal fin regeneration is characterized by a proliferation boost in the mesenchymal blastema that is controlled precisely in time and space. This allows a gradual and robust restoration of original fin size. However, how this is est...