Santa's Little Helper Santa's Little Helper Santa's Little Helper is a recurring character in the American animated television series "The Simpsons". He is the pet greyhound of the Simpson family. The dog was introduced in the first episode of the show, the 1989 Christmas special "Simpsons Roasting on an Open Fire", in which his owner abandons him for finishing last in a greyhound race. Homer Simpson and his son Bart, who are at the race track in hope of winning some money for Christmas presents, see this and decide to adopt the dog. Santa's Little Helper has since appeared frequently on "The Simpsons",
T helper 3 cell T helper 3 cell T helper 3 cells (T3) are white blood cells of the lymphocyte type. They are involved in regulating the body's immune response. The function of T helper cells generally is to mediate the immune response by secreting cytokines and interacting with B-cells to enhance or inhibit their activity. This is of particular importance in the gut as this is where the highest load of foreign material, food, is present. T3 cells are involved in mucosal immunity and protecting mucosal surfaces in the gut from non-pathogenic non-self antigens. They mediate this non-inflammatory environment by secreting TGF-β and