Khan Academy
Khan Academy: Biology: Helper T Cells
A detailed introduction to helper T cells and their function. [20:33]
Howard Hughes Medical Institute
Hhmi: Bio Interactive: Cloning an Army of T Cells for Immune Defense
View this video/animation to see how one type of immune cell-the helper T cell-interprets a message presented at the surface of the cell membrane. The message is an antigen, a protein fragment taken from an invading microbe. A series of...