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6 protocols using bovine serum

1

Quantifying Nucleic Acid Content

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The Quant-iT ™ Picogreen ® assay kit and the Presto Blue kit were from Life Technologies (Carlsbad, US).
Bovine serum, L-glutamine, penicillin and streptomycin were from Gemini Bio-Products (Sera Laboratories International, Bolney, UK). All other reagents were purchased from Sigma-Aldrich (Poole, UK).
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2

Cell Culture Conditions for Y79-Rb and HeLa

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Cell lines were cultured as follows: Both Y79-Rb (ATCC, HTB-18; Manassas, VA) and Hela cells (ATCC, CCL-2; Manassas, VA) were grown in DMEM (Mediatech, Manassas, VA) supplemented with 5% heat-inactivated bovine serum (Gemini Bio-Products, Sacramento, CA) and 1% Penicillin/Streptomycin. Cultures were maintained at 37°C with 5% CO2.
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3

Culturing and Embedding Stem Cells

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Previously characterised human stem cells of the apical papilla (SCAP) (RP89 cells) 27 were used between passages 6 and 9. SCAP were grown at 37°C in 5% CO2 in Minimum Essential Medium (Sigma-Aldrich) supplemented by 10% bovine serum (Gemini Bio-Products), 1% of L-glutamine (Gemini) and 1% of penicillin and streptomycin (Gemini) until they reached ~80% confluence. SCAP were then incorporated in the pre-gel solutions, placed in 96 well plates and incubated at 37°C for 1 hr.
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4

Influenza Virus Propagation and Cell Line Engineering

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To propagate influenza viruses, MDCK-SIAT1 cells (Millipore Sigma) were used. Cells were maintained with complete media comprising Dulbecco’s modified Eagle’s medium high glucose (DMEM; ThermoFisher) supplemented with 10% (v/v) heat-inactivated fetal bovine serum (Gemini Bio-Products), 100 units ml−1 penicillin (ThermoFisher), 100 μg ml−1 streptomycin (ThermoFisher), and geneticin (1 mg ml−1) (ThermoFisher). To develop constitutively PB1- or HA-expressing MDCK-SIAT1 cells, one plasmid encoding both puromycin resistance and influenza genes was transfected into MDCK-SIAT1 cells using Lipofectamine 2000 (ThermoFisher). Two days post transfection, cells were transferred from 6-well plates into 10-cm dishes containing DMEM media with 10% bovine serum (Gemini Bio-Products), penicillin, streptomycin, geneticin, and puromycin (0.25 μg ml−1; ThermoFisher) for selection. Medium was changed every 48 h. Clonal selection was performed using 8 or 10 mm cloning cylinders (Fisher Scientific) about 2 weeks after the transfection. Clonal cell lines were screened using a reporter virus prepared on a polyclonal cell line. To rescue influenza viruses, Flp-In 293 cells (ThermoFisher) were transfected as described below.
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5

Axenic Culture of E. histolytica Trophozoites

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E. histolytica strain HM1:IMSS trophozoites were grown axenically in TYI-S-33 (trypticase-yeast extract-iron-serum) medium supplemented with 1X Diamond's vitamins (SAFC Biosciences, Lenexa, KS, USA), 15% heat-inactivated bovine serum (Gemini Bio-Products, West Sacramento, CA), 100 U penicillin/ml and 100 mg streptomycin sulfate/ml (Gibco/Life Technologies, Grand Island, NY, USA), at 37°C in T-25 tissue culture flasks [31 (link)].
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6

Establishing SH-SY5Y Neuronal Cell Lines

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Cell cultures were authenticated prior to purchase from American Type Culture Collection and again at passages 20 to 50 after purchase for morphology, growth rate, and expression of a discrete selection of human genes expressed in mature neurons (Supplement Table 1). SH-SY5Y clonal lines were grown in Dulbecco’s Modified Eagle’s Medium: Ham’s F12 (1:1) media (Gibco, Gaithersburg, MD), supplemented with 2 mM L-alanyl-L-glutamine dipeptide (GlutaMAX), 100 IU/ml penicillin, 100 µg/ml streptomycin (Thermo Fisher Scientific, Waltham, MA) and 10% heat-inactivated bovine serum (Gemini Bio Products, Sacramento, CA). Plasmids containing long isoform hCB1 receptor, hCB2 receptor, or the neo gene (Missouri S&T cDNA Resource Center, Rolla, MO) were transfected using Lipofectamine (Invitrogen, Life Technologies, Carlsbad, CA). The cells were selected for plasmid expression using 450 mg/L geneticin (G418) (Life Technologies, Carlsbad, CA) and clonal cell lines were isolated.
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