Dynamical parton distributions of the nucleon

The dynamical distributions of the nucleon are radiatively generated from valence-like definite positive input densities at an optimally chosen low scale and are in contrast to distributions generated from input densities at some fixed and higher scale. We outline the main results encountered in the determination of a new generation of dynamical distributions and their uncertainties. In particular the dynamical distributions turned out to be more strongly constrained, specially in the (presently unexplored) very small-x region.