tokens: To understand the basis for the increased cell surface stability compared with wild-type peptide and to understand the differences in T cell recognition between I1Y and I1F , we determined the x-ray crystal structures of the two class I MHC-peptide complexes .
folded_tokens: to understand the basis for the increase cell surface stability compare with wild-type peptide and to understand the difference in t cell recognition between i1y and i1f , we determine the x-ray crystal structure of the two class i mhc-peptide complex .