Lysyl oxidase (LOX) activity was measured using the Lysyl Oxidase Activity Assay Kit (Abcam, Cambridge, UK) following the manufacturer's instructions. Briefly, cell culture supernatants were collected and incubated for 30 min in the presence of 50 μl of the reaction mixture. Fluorescence was monitored with a fluorescence plate reader at 540/590 nm excitation/emission wavelengths.
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