A Cofactor Regeneration System for 2‐Aminobutyric Acid Production Based on Combined Cross‐Linked Enzyme Aggregates: Utilizing His‐Tagged Enzymes With Low‐Concentration Calcium Ions as Precipitant. - Liu, Jingran; Li, Ren; Miao, Jincheng; Sun, Hongxu; Chen, Qiwei; Song, Haiyan; Peng, Hui; Chang, Yanhong; Luo, Hui (Engineering in Life Sciences, 2025)