Fibroblasts are cultured in Dulbecco’s modified eagle media (DMEM) 4500 (mg/L) growth medium supplemented with Glutamax (Gibco), 10% foetal bovine serum (FBS), non-essential amino acids (NEAA: 0.1 mM of: glycine, L-alanine, L-asparagine, L-aspartic acid, L-glutamic acid, L-proline and L-serine) and penicillin/streptomycin antibiotic cocktail (50ng/ml) at 37°C and 5% CO2.