To determine levels of IL-6 in OP9 cells, samples were analyzed using a commercially available mouse IL-6 ELISA Kit, (RAB0308, Sigma-Aldrich, Tokyo, Japan). At the end of the cultivation process, cell culture supernatants were collected and reacted with the first and secondary antibodies, streptavidin-HRP, and detection solution according to the manufacture’s instruction. The reaction was stopped using the stop solution (from the ELISA kits) and absorbance was read at 450 nm using a microplate reader (SH-9000Lab, Hitachi, Tokyo, Japan) [23 (link)].
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