These are digital images of sections from cerebella from a P29 Gjb1−/Y//Gjc2−/− mouse and a littermate control (Gjb1+/Y//Gjc2+/−), immunostained with a CD72 antibody, a B-cell marker. Because the Egfp gene was “knocked into” the Gjc2- null allele, oligodendrocytes are EGFP-positive in both genotypes. The granular cell layer (GCL), and white matter (WM) are labeled. Unlike the littermate control, the Gjb1−/Y//Gjc2−/− had scattered CD72-positive cells . Scale bars: 10 µm.