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6 protocols using polyethylene glycol

1

Microcell-Mediated Chromosome Transfer

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MMCT was performed as described previously (Tomizuka et al. 1997 (link)). Briefly, the MI-MAC was transferred from CHO cells into TT2 or TT2F mES cells via mouse A9 cells by MMCT. Donor cells with the MI-MAC were treated with 0.05–0.1 µg/mL colcemid (Gibco) to form microcells. Microcells were collected by centrifugation and fused with recipient cells by polyethylene glycol (Wako, Japan). Hybrid cells containing the MI-MAC were selected in media containing 1 × HAT Supplement (Gibco) or 200 µg/mL Hygromycin B (Wako, Japan).
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2

Synthesis of Metal-Organic Composite Materials

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Tin chloride dihydrate (SnCl2·2H2O), oxalic acid dihydrate, and polyethylene glycol (PEG, approximate molecular weight 400) were purchased from Fujifilm Wako Chemicals, Osaka, Japan and used as received. Ethanol (99.5%) was also purchased from Kanto Chemical Co., Inc., Tokyo, Japan. H2O (resistivity: 18.2 MΩ·cm) was obtained using a Milli-Q® integral water purification system (MERCK Ltd., Tokyo, Japan).
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3

Gelatin-Lipid Hybrid Nanoparticle Fabrication

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1,2-Dioleoyl-sn-glycero-3-phosphatidylcholine
(PC), 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine
(PE), and polyethylene glycol (molecular weight 20,000; PEG 20k) were
purchased from Wako Pure Chemical Industries (Osaka, Japan). Mineral
oil was purchased from Nacalai Tesque (Kyoto, Japan), while alkali-treated
gelatin was supplied by Nitta Gelatin Co. (Osaka, Japan). The average
molecular weight of the gelatin as determined by gel-permeation chromatography
was 190 kDa. Fluorescein isothiocyanate isomer I (FITC; Sigma-Aldrich
Japan, Tokyo, Japan) and Rhodamine B labeled 1,2-dihexadecanoyl-sn-glycero-3-phosphatidylethanolamine (Rho-PE) (Invitrogen;
Carlsbad, CA, USA) were used as fluorescent dyes for the gelatin and
lipid, respectively. Thioflavin T (ThT; Wako Pure Chemical Industries)
was used to detect β sheet rich structures like the amyloid
structures. All the materials were used without further purification.
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4

Sensitive MALDI-TOF MS Analysis

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BPA, trifluoroacetic acid (TFA), LC/MS grade acetonitrile (ACN), polyethylene glycol (PEG) 200 and PEG600, sodium trifluoroacetate (TFANa) were purchased from FUJIFILM Wako Pure Chemical Corporation (Osaka, Japan). 2,5-Dihydroxybenzoic acid (DHB) and α-Cyano-4-hydroxycinnamic acid (CHCA) was purchased from Tokyo Chemical Industry Co., Ltd. (Tokyo, Japan).
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5

Cytoskeletal Structure Analysis

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Glutaraldehyde and tannic acid were purchased from Electron Microscopy Sciences (Hatfield, PA); osmium tetroxide from TAAB (Berks, England); and glycine, polyethylene glycol, Tween 20, and NaBH4 from Wako (Osaka, Japan).
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6

Cellulose-Based Hydrogel Synthesis

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Cotton-derived fibrous cellulose was obtained by cutting and milling of Whatman filter paper No. 5 (GE Healthcare Life Sciences Corp.). Sulfuric acid (Nacalai Tesque, Inc.) and polyethylene glycol (PEG; molecular weight = ~20,000, Wako Pure Chemical Ind., Ltd.) were used as received. Monomers, HEMA (Wako Pure Chemical Ind., Ltd.) and AA (Nacalai Tesque, Inc.), were purified by vacuum distillation before use. A photopolymerization initiator, 2-hydroxy-2-methylpropiophenone (HMPPh; Sigma-Aldrich), and a cross-linking agent, ethylene dimethacrylate (EDM; Tokyo Kasei Kogyo Co., Ltd.), were used without further purification.
Calcium chloride dihydrate (CaCl 2 •2H 2 O) and ammonium carbonate ((NH 4 ) 2 CO 3 ) were purchased from Nacalai Tesque, Inc. and used as ion sources for mineralization. A low-molecular-weight PAA (L-PAA; average degree of polymerization (DP) = 25, Sigma-Aldrich) was used as a precipitation inhibitor in the salt solution of ion server [25, 37] . Other conventional chemicals were purchased from Wako Pure Chemical Ind., Ltd. or Nacalai Tesque, Inc. and used as received.
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