In situ localization of CB2 receptors on tonsil tissue sections. Frozen tissue sections were simultaneously labeled with MoAbs characterizing different anatomical compartments in tonsils and with anti-CB2 receptor Abs. The MoAb labeling are displayed in the first column and are green-colored: CD3 (I); anti-IgD (II); CD38 (III); anti-follicular dendritic cells (IV); anti-Ki67 (V). The anti-CB2 receptor Ab labelings are displayed in the second column and are red-colored. The last line shows an irrelevant control performed with the specific peptide as described in Fig 2. The third column shows the merge colors. These data are representative of three different tonsils.