Methods in Enzymology, Volume 650 continues the legacy of this premier serial with quality chapters authored by leaders in the field. Chapters in this new release include Biophysical methods to study lanthanide-protein interactions, Genetically encoded sensors to study lanthanide biology, Spectrophotometric methods to determine the stability constants of lanthanide-macromolecule complexes, Lanthanide-based probes for amino acid modifications, In vitro selection and application of lanthanide-dependent DNAzymes, LRET biosensors for imaging protein interactions in living cells, Synthetic Modeling of the Structure and Function of the Lanthanide-Dependent, MDH Cofactor, EPR spectroscopy of lanthanides, Macromolecular crystallography for f-element complex characterization, and much more.