Four‐fold Channel‐Nicked Human Ferritin Nanocages for Active Drug Loading and pH‐Responsive Drug Release. - Ahn, Byungjun; Yoon, Hye Ryeon; Lee, Jeong Min; Oh, Hyeok Jin; Jung, Yongwon; Lee, Seong‐Gyu; Kim, Ho Min (Angewandte Chemie International Edition, 2018)