histone demethylase activity GO:0032452 Reactome:R-HSA-5661116 Reactome:R-HSA-5661115 Reactome:R-HSA-5625870 Reactome:R-HSA-3214912 Reactome:R-HSA-5661114 Reactome:R-HSA-4722133 Reactome:R-HSA-4724279 Reactome:R-HSA-4754181 Reactome:R-HSA-5625848 Reactome:R-HSA-4754187 Reactome:R-HSA-4724284 Reactome:R-HSA-5661121 Reactome:R-HSA-5661120 Reactome:R-HSA-5423117 Reactome:R-HSA-5661123 Reactome:R-HSA-5661122 Reactome:R-HSA-5661125 Reactome:R-HSA-5661124 molecular_function Reactome:R-HSA-4754176 Catalysis of the removal of a methyl group from a histone. Reactome:R-HSA-5625797 protein demethylase activity histone modifying activity