Methods and apparatus are provided for an integrated circuit with a transistor and a resistor. Supporting the retractable athletic surface in the opening is a platform. The first stack may include alternating layers of a first material having a first refractive index and a second material having a second refractive index that differs from the first refractive index. The invention also relates to novel peptide: peptide complexes such as BAX peptideHLA complexes and their use in a tumour-specific vaccine.