“…Actually, in , the authors considered fast‐slow dynamics, meaning that – are written in the form where ε ′ is a second small parameter. The corresponding reaction‐diffusion system then reads The mathematical analysis of – (and, in particular, the well‐posedness) appears to be challenging for negative initial data, because of the coupling terms (note that the well‐posedness for the system of ODE's – is also challenging; in and , questions related to equilibria are addressed); see however Remark in the succeeding discussions for some comments on the full system –.…”