**Question:** Anitschow cells are found in all except:

A. Liver
B. Kidney
C. Lymph nodes
D. Spleen

**Core Concept:** Anitschow cells are a type of lymphocyte, a type of white blood cell that plays a crucial role in the adaptive immune response. They are named after the German pathologist Julius Anitschkow, who first described them. Anitschow cells are primarily involved in the immune response and can be found in various tissues throughout the body.

**Why the Correct Answer is Right:** Anitschkow cells are primarily found in lymphoid tissues, such as lymph nodes, thymus, and spleen. They are involved in the activation and differentiation of B cells and T cells, which are further involved in the adaptive immune response.

**Why Each Wrong Option is Incorrect:**

A. Liver: Anitschkow cells are not typically found in significant quantities in the liver due to the liver's role in detoxification and filtration rather than immune response.
B. Kidney: Similar to the liver, the kidney's primary function is filtration and detoxification, making Anitschkow cells less abundant in the kidney compared to lymphoid tissues.
C. Lymph nodes: Though present in lymph nodes, the correct answer is right because these cells are more abundant in the lymphoid tissues.
D. Spleen: Anitschkow cells are also present in the spleen, but they are more abundant in the spleen's white pulp, which is involved in the immune response.

**Clinical Pearl:** Anitschkow cells play a vital role in the immune system, particularly in the activation and differentiation of B cells and T cells. Understanding their distribution is essential for understanding the immune response and its regulation within the human body.