1. Immunology of the healthy liver: Old questions and new insights
Wajahat Z. Mehal, Francesco Azzaroli, I. Nicholas Crispe 
Gastroenterology 
Volume 120, Issue 1, Pages (January 2001)
DOI: /gast
Copyright © 2001 American Gastroenterological Association Terms and Conditions

2. Fig. 1
Typical composition of the hepatic nonparenchymal cell (NPC) population in rodents and humans. IHL, intrahepatic lymphocytes; DN, double negative (CD4 and CD8 negative).
Gastroenterology  , DOI: ( /gast )
Copyright © 2001 American Gastroenterological Association Terms and Conditions

3. Fig. 2
Accumulation and apoptosis of T cells in the liver after activation by specific peptide. (A) H&E staining at 200× magnification showing T-cell accumulation in the liver parenchyma and around a central vein. (D) Hematoxylin at 400×. (B and C) Hematoxylin and TUNEL (terminal deoxynucleotidyl transferase–mediated deoxyuridine triphosphate nick-end labeling) staining demonstrating apoptotic nuclei (green). The majority of the apoptotic nuclei are of T cells (arrowhead), but apoptotic hepatocyte nuclei are also present (arrow).
Gastroenterology  , DOI: ( /gast )
Copyright © 2001 American Gastroenterological Association Terms and Conditions

4. Fig. 3
Two proposed immunologic functions of the normal liver. (A) Retention and apoptosis of activated CD8+ T cells flowing into the liver. (B) Activation, proliferation, and apoptosis of resting CD8+ T cells that recognize hepatic antigens.
Gastroenterology  , DOI: ( /gast )
Copyright © 2001 American Gastroenterological Association Terms and Conditions