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Mapping of core regions recognized by CD4+ T‐cell clones. (a–e) Peptides of 13‐ and 11‐mer spanning overlapping regions were synthesized and tested for antigenicities in enzyme‐linked immunosorbent spot assays. Numbers represent Epstein–Barr virus nuclear antigen 1 amino acid residues. All results are the mean of two duplicate values. SFC, spot forming units.
