The Simpsons Guy him how to skateboard, and they become good friends. When Nelson Muntz bullies Bart, Stewie retaliates by kidnapping and torturing Nelson. Meanwhile, Lisa tries to find a talent that Meg has. When she finds that Meg is a natural at the saxophone, she downplays the talent out of jealousy. Chris and Brian take the Simpsons' dog, Santa's Little Helper, for a walk. Brian tries to teach Santa's Little Helper independence, but the latter runs off when freed. Marge notices Santa's Little Helper is missing, and Chris and Brian fake his presence until he eventually returns. Homer and Peter try different
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,