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<b>Kdm4a is an activity downregulated barrier to generate </b><b>engrams</b><b> for memory separation</b>AuthorsXiuxian Guo¹, Pengfei Hong¹, Songhai Xiong¹, Yuze Yan¹, Hong Xie^3*, Ji-Song Guan^1,2*¹School of Life Science and Technology, ShanghaiTech University, Shanghai, China²State Key Laboratory of Advanced Medical Materials and Devices, ShanghaiTech University, Shanghai, China³Institute of Photonic Chips, University of Shanghai for Science and Technology, Shanghai, China*Correspondence:Ji-Song Guan [e-mail];Hong Xie [e-mail]