Lysine-specific histone demethylase 1 (LSD1) (also known as KDM1) is a member of a broad family of monoamine oxidases and is encoded by the KDM1A gene. However, LSD1 requires the flavin adenine dinucleotide (FAD) as a cofactor to catalyze demethylase activity. For example, LSD1 catalyzes demethylation at H3K4me1/2 and...