This volume discusses different approaches towards understanding the brain plasticity, aging, and regeneration of the nervous system in model organisms. Chapters guide the reader through an overview of model organisms,  setup of an aquatic system, Tol2-mediated transgenesis, CRISPR/Cas9-mediated gene knock-out and knock-in, Cas13d-mediated gene knockdown, tissue clearing and expansion methods for brain and spinal cord imaging,  Histological techniques, chromatin Immunoprecipitation Sequencing (ChIP-Seq) analysis, single-cell RNA sequencing analysis, BrdU/EdU incorporation assays, brain and...