OrthoDB v9.1: cataloging evolutionary and functional annotations for animal, fungal, plant, archaeal, bacterial and viral orthologs. - Evgeny M. Zdobnov; Fredrik Tegenfeldt; Dmitry Kuznetsov; Robert M. Waterhouse; Felipe A. Simão; Panagiotis Ioannidis 001; Mathieu Seppey; Alexis Loetscher; Evgenia V. Kriventseva (Nucleic Acids Res., 2017)