Key

BC, Billroth's cord (splenic cord)

CA, central artery

En, endothelial cell nucleus

GC, germinal center

VS, venous sinus

WBC, white blood cells arrowheads (Fig. 3, inset), silver-positive fibers (basal lamina material) circumscribing the venous sinus endothelium seen in cross-sectional profile arrows: Fig. 1. pigment (contained in macrophages); Fig. 3 (inset), silver-

positive fibers (basal lamina material) circumscribing the venous sinus endothelium asterisks (Fig. 1), wall of venous sinus seen in tangential section

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