Saturated spreading, an alternative to Fick's law: comment on "Morphogenetic action through flux-limited spreading", by M. Verbeni, O. Sánchez, E. Mollica, I. Siegl-Cachedenier, A. Carleton, I. Guerrero, A. Ruiz i Altaba, J. Soler
1 Departament de Tecnologies de la Informació i les Comunicacions, Universitat Pompeu-Fabra, Barcelona, Spain. Electronic address: vicent.caselles@upf.edu.