DNA Repair, Volume 45 in The Enzymes series highlights new advances in the field, with this new volume presenting interesting chapters on DNA polymerase beta and other gap-filling enzymes in mammalian base excision repair, Translesion polymerases, mechanism and function, The Rev1-Polζ Mutasome: Structure and Interactions in Translesion Synthesis, Challenges for base excision repair enzymes: acquiring access to damaged DNA in chromatin Nucleotide excision repair, DNA damage recognition mechanisms in mammalian nucleotide excision repair, Advances in understanding DNA mismatch repair, and more.