Cover photograph: Overall structure of neutrally evolved fungal peroxygenase engineered by genetic drift and DNA shuffling. The neutral mutations (highlighted in green) are mapped in the crystal structure of peroxygenase from Agrocybe aegerita (PDB accession number 2YOR), and the model was generated by the PyMol molecular visualization system. (See related article at e00808–18.) (Copyright © 2018 Martin-Diaz et al. CC-BY 4.0.)