There will be no additional fee for the analysis and dendrogram maintenance for any sequences performed at the U of MN VDL. H1 clades are determined using the Swine H1 Clade Classification available from the NIAID Influenza Research Database (IRD) [Zhang Y, et al. (2017)] through the web site at http://www.fludb.org. For more information on H1 clade information and methodology, please refer to "A Phylogeny-Based Global Nomenclature System and Automated Annotation Tool for H1 Hemagglutinin Genes from Swine Influenza A Viruses." Tavis K.