For in vitro myelination assay, O4+ RRMS and control hiOL were purified by flow cytometry at day 21 of differentiation. Afterwards, 1 × 105 O4+ hiOL were seeded in DM onto aligned nanofibers (Nanofiber solutions) that were coated with 1 µg/mL PLO and 5 µg/mL Laminin LN211 (Biolamina) beforehand. For staining of nanofibers, coating was performed by replacing PLO with 100 µg/mL PLL-FITC (Sigma). Half of the medium was changed every other day. After 7 days, cells were fixed and stained for MBP. A previously published heuristic algorithm was used for quantification [66 (link)].
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