Abstract. We study positive blowing-up solutions of the system:as well as of some more general systems. For any p, q > 1, we prove single-point blow-up for any radially decreasing, positive and classical solution in a ball. This improves on previously known results in 3 directions:(i) no type I blow-up assumption is made (and it is known that this property may fail);(ii) no equidiffusivity is assumed, i.e. any δ > 0 is allowed; (iii) a large class of nonlinearities F (u, v), G(u, v) can be handled, which need not follow a precise power behavior.As side result, we also obtain lower pointwise estimates for the final blow-up profiles.