IgG in the walls of the post-capillary venules of mouse lymphatic tissue.

IgG was demonstrated in the endothelium of the post-capillary venules of the axillary and abdominal lymph nodes as well as of the Peyer's patches in DBA/2 mice by using a direct immunoperoxidase technique. The significance of this IgG in the regulation of T-lymphocyte passage through the endothelium of the post-capillary venules was discussed.