Glycerol in media was measured using Free Glycerol Reagent (Sigma Aldrich, St Louis, MO, USA) and Amplex UltraRed (Invitrogen), according to the manufacturers’ instructions. Amplex Ultra Red was diluted 100-fold in Free Glycerol Reagent, mixed with 20 μl of conditioned medium in a 96-well plate, and incubated at room temperature for 15 min. Fluorescence was measured (excitation/emission wavelengths 530 nm / 590 nm) using an Infinite M200 plate reader (Tecan Group, Männedorf, Switzerland).
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