{'fraction_non_alphanumeric': 0.04477611940298507, 'fraction_numerical': 0.028358208955223882, 'mean_word_length': 4.591666666666667, '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}}
A factor potentiating antibody formation spontaneously produced by splenic T cells of MRL/MP-lpr/lpr mice.

Splenocytes of MRL/l mice, one of the murine lupus strains, were found to produce a factor(s) which potentiates antibody formation. This factor was produced by splenocytes of young MRL/l mice and cell-sorting experiments by flow cytometry indicated that Thy 1.2+ cells were producing the factor. The approximate molecular weight of the factor was found to be 35,000-45,000 daltons and its pI value was between 3.3 and 3.8. It was also demonstrated that this factor is distinct from interferons, interleukins (IL-1, IL-2, IL-3) and B cell differentiation factors.