DNA Repair Enzymes, Part A, Volume 591 is the latest volume in the Methods in Enzymology series and the first part of a thematic that focuses on DNA repair enzymes. Topics in this new release include chapters on the Optimization of Native and Formaldehyde iPOND Techniques for Use in Suspension Cells, the Proteomic Analyses of the Eukaryotic Replication Machinery, DNA Fiber Analysis: Mind the Gap!, Comet-FISH for Ultrasensitive Strand-Specific Detection of DNA Damage in Single Cells, Examining DNA Double-Strand Break Repair in a Cell Cycle-Dependent Manner, Base Excision Repair Variants in Cancer, and Fluorescence-Based Reporters for Detection of Mutagenesis in E. coli.