Comparison of the GSMF with and without AGN. The stellar mass function of galaxies at 3.5 ≤ z ≤ 4.5 in the CANDELS GOODS-South field without AGN (filled black triangles) and with the AGN included (red asterisks). The error bars show the Poissonian uncertainties of each point. The stellar masses for the AGN have been derived using the same technique adopted for normal galaxies. The solid continuous curve shows the Schechter function derived through a parametric STY maximum likelihood fit of the GSMF without AGN.