Fuwai Central-China Hospital, Central-China Subcenter of National Center for Cardiovascular Diseases 1 article published in JoVE Biochemistry Transplantation of Neonatal Mouse Cardiac Macrophages into Adult Mice Yandong Li1, Jie Feng1, Yan Li1, Jianqiu Pei1, Shengshou Hu1, Yu Nie1,2 1Fuwai Hospital & Chinese Academy of Medical Sciences, State Key Laboratory of Cardiovascular Disease, Cardiovascular Institute, National Center for Cardiovascular Diseases, Peking Union Medical College, 2National Health Commission Key Laboratory of Cardiovascular Regenerative Medicine, Fuwai Central-China Hospital, Central-China Subcenter of National Center for Cardiovascular Diseases We provide a protocol for neonatal cardiac macrophage separation and transplantation into an adult mouse heart, which could be a promising way to promote cardiac repair.