Corrigendum: Acidic Versus Alkaline Bacterial Degradation of Lignin Through Engineered Strain E. coli BL21(Lacc): Exploring the Differences in Chemical Structure, Morphology, and Degradation Products - Murillo Morales, Gabriel; Ali, Sameh S.; Si, Haibing; Zhang, Weimin; Zhang, Rongxian; Hosseini, Keyvan; Sun, Jianzhong; Zhu, Daochen (Frontiers in Bioengineering and Biotechnology, 2020)