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1

Pervanadate Treatment of Serum-Starved Cells

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Unless otherwise indicated, experiments were performed in ∼90% confluent cells cultured in regular cell culture medium. When indicated, cells were serum-starved overnight in medium containing 0.5% fetal bovine serum. Cells were treated for 15 min with 100 μM pervanadate, prepared according to a published protocol (63 (link)). When indicated, cells were incubated for ∼18 h with 5 μM PP2, an SFK inhibitor (Merck Millipore). In some experiments, serum-starved cells were treated for 15 min with 40 ng/ml recombinant human EGF (#E-100, Alomone Labs) alone, or in combination with 100 μM pervanadate.
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2

Efficient Generation of iPSC-Derived Organoids

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On day 0 of organoid production, induced pluripotent stem cells (iPSCs), at ~ 80% confluence, were dissociated into small clumps with gentle cell dissociation reagent (StemCell Technologies, 07174) and plated into round-bottom, low-attachment 96 well plates (ThermoFisher, 174925; ~ 15,000 cells per well). Initial media, consisting of mTeSR Plus (Stem Cell Technologies, 05825) supplemented with 5 µm A-83 (Peprotech, 9094360) and 5 µm Dorsomorphin (Peprotech, 8666430), was replaced every other day starting at day 2 by removing half of the media in each well (100 µL) and replacing with fresh media three times. On day 8, media was changed to a base media of Neurobasal A media (Gibco, 10888022) with NeuroCult SM1 (StemCell Technologies, 05711), glutamax (Gibco, 35050061), and Pen/strep (Gibco, 15140122) supplemented with EGF (20 ng/ml; Alomone Labs, E-100) and FGF2 (20 ng/ml; Alomone Labs, F-170). Media was similarly exchanged every other day until day 20 when the mitogenic supplements were exchanged for differentiating factors: BDNF (20 ng/ml; Alomone Labs, B-250) and NT3 (20 ng/ml; Alomone Labs, N-260) in the same base media. After two weeks in differentiation media, organoids could be maintained in the base media for > 100 days41 (link).
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3

Evaluating BRAF inhibitor combinations

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The reagents used included PLX4032 (vemurafenib; MedChemExpress, HY-12057), LGX818 (encorafenib; MedChemExpress, HY-15605), GSK2118436A (dabrafenib; Selleckchem, S2807), PLX8394 (MedChemExpress, HY-18972), Benzyl-coelenterazine (Nanolight, 301), and human EGF (Alomone Labs, E-100).
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