Gas metallicity gradients as a function of stellar mass for the subhalos from the TNG50 simulation. The black circles correspond to the subhalos in Fornax-like clusters, while the red circles indicate subhalos from our control sample (see text). The green squares show the median value for the control sample, and the vertical line shows the 1σ dispersion. Bottom panel: difference in metallicity gradient between each subhalo and the corresponding value for the control sample.