Peanut Patch' could cure peanut allergies in children

The video tutorial explains the process of epicutaneous immunotherapy, where an allergen is applied to the skin to trigger an immune response. Langerhans cells, which are antigen-presenting cells in the stratum spinosum, transport the allergen to the immune system. Once inside, the allergen interacts with T lymphocytes, leading to the cloning of T cells to achieve tolerization.

In which layer of the skin are the most prominent immune cells found?

What is the term for the process where T cells make clones of themselves?