How Munched Is That Birdie in the Window? the fact that he still had not forgiven Milhouse for breaking his toy car, believing it to be a Transformer). When they take him to a therapy session with Dr. Thurmond (voiced by guest star Rachel Weisz), she tries to convince Bart that Santa's Little Helper is an innocent creature who never had the intention to hurt him and that Bart should forgive him. When this fails (thanks in no small part to Helper's taste for birds) she advises the Simpsons that the only cure for Bart’s blues is to give away the family dog, leaving Lisa mad at Bart
T helper cell because such knowledge may be very useful in the treatment of disease and in increasing the effectiveness of vaccination. Proliferating helper T cells that develop into effector T cells differentiate into two major subtypes of cells known as T1 and T2 cells (also known as Type 1 and Type 2 helper T cells, respectively). T1 helper cells lead to an increased cell-mediated response, typically against intracellular bacteria and protozoa. They are triggered by IL-12 and their effector cytokines are IFN-γ and IL-2. The main effector cells of T1 immunity are macrophages as well as CD8 T cells, IgG B cells,