{'fraction_non_alphanumeric': 0.029865125240847785, 'fraction_numerical': 0.03468208092485549, 'mean_word_length': 5.259036144578313, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Demonstration of multiple antigenic sites of the SV40 transplantation rejection antigen by using cytotoxic T lymphocyte clones.

Multiple antigenic sites on the simian virus 40 (SV40) tumor-specific transplantation antigen (TSTA) were detected by the use of cytotoxic T lymphocyte (CTL) clones isolated from continuous cultures of SV40-specific CTL (H-2b). Two independently derived clones, K11 and K19, specific for the SV40 TSTA in association with H-2Db, each recognized a different antigenic determinant of the SV40 TSTA. This conclusion was based on the observation that a human papovavirus BK virus (BKV) transformed cell line, which possesses a T antigen serologically cross-reactive with that of SV40, was lysed by a heterogeneous population of SV40-immune lymphocytes and by clone K19 but not by K11. Therefore, these CTL clones must recognize two different antigenic determinants of the SV40 TSTA:K19 recognizes a cross-reactive determinant of the SV40 and BKV TSTA, whereas K11 is reactive against an SV40-specific determinant.