TYRP1 and vitiligo: The inability of T cells from Ag+GILT-/-Tg mice to induce vitiligo is not due to reduced T cell numbers as there was no difference between the percentage of TRP1-specific T cells recovered from GILT-/-RAG1-/- mice that received T cells from Ag+GILT-/-Tg mice and GILT-/-RAG1-/- recipients that received T cells from Ag-GILT+/+Tg donors which did develop autoimmunity (Fig 1b and 1c).