The B cell hybridoma B9 has been cloned from the parent line B13.29 and is highly dependent on IL-6 for growth. Cells also proliferate in response to high concentrations (approximately 1000 pg/ml) of murine IL-4 and human IL-13. The cells have been used in bioassays for IL-6 of human, bovine, horse, pig, dog, rat, mouse and seal origin. For routine culture, cells are grown in 10-100 units/ml IL-6. An IL-6 assay can be carried out in a flat bottom microtiter plate in 200μl. 5000 B9 cells/well are cultured and labeled at 68-72 hours with 7.4kBq 3H-Thymidine. Samples to be tested are titrated and related to a standard preparation; 1U/ml is the concentration that leads to half-maximal 3H-Thymidine incorporation.
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