
Secondary lymphoid nodule
This image shows a more fully developed secondary nodule with a large germinal center. The darkly staining perimeter of the nodule, the mantle, is composed mainly of tightly packed B lymphocytes formed in the germinal center. The germinal center can be subdivided into an upper light region and a lower dark region. 200x

Secondary lymphoid nodule
This image shows a more fully developed secondary nodule with a large germinal center. The darkly staining perimeter of the nodule, the mantle, is composed mainly of tightly packed B lymphocytes formed in the germinal center. The germinal center can be subdivided into an upper light region and a lower dark region. 200x

- Germinal center
This image shows a more fully developed secondary nodule with a large germinal center. The darkly staining perimeter of the nodule, the mantle, is composed mainly of tightly packed B lymphocytes formed in the germinal center. The germinal center can be subdivided into an upper light region and a lower dark region. 200x

- Mantle
This image shows a more fully developed secondary nodule with a large germinal center. The darkly staining perimeter of the nodule, the mantle, is composed mainly of tightly packed B lymphocytes formed in the germinal center. The germinal center can be subdivided into an upper light region and a lower dark region. 200x

Diffuse lymphoid tissue
This image shows a more fully developed secondary nodule with a large germinal center. The darkly staining perimeter of the nodule, the mantle, is composed mainly of tightly packed B lymphocytes formed in the germinal center. The germinal center can be subdivided into an upper light region and a lower dark region. 200x

Epithelium
This image shows a more fully developed secondary nodule with a large germinal center. The darkly staining perimeter of the nodule, the mantle, is composed mainly of tightly packed B lymphocytes formed in the germinal center. The germinal center can be subdivided into an upper light region and a lower dark region. 200x

Lamina propria
This image shows a more fully developed secondary nodule with a large germinal center. The darkly staining perimeter of the nodule, the mantle, is composed mainly of tightly packed B lymphocytes formed in the germinal center. The germinal center can be subdivided into an upper light region and a lower dark region. 200x