HDFα cells were purchased from Life technologies (cat. No. C0135C) and cultured in a specific pathogen-free cell culture laboratory at 37°C in 5% CO2. HDFα cells were maintained in Medium 106 (Life Technologies Corporation, Carlsbad, USA) supplemented with LSGS (Life Technologies Corporation, Carlsbad, USA) and amphotericin B (Sigma). 160 μg/ml gentamycin (Sandoz, Sandoz GmbH, Austria).
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