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As part of the Viral Genome Project at National Center for Biotechnology Information (NCBI), complete viroid genomes are collected from all viroid sequences in GenBank.A reference sequence record is created for each species, and other complete genomes within the same species are tagged as neighbors.The reference sequence records are curated by NCBI staffs, who work closely with the ICTV Study Group for viroids, to maintain high standards of annotation and taxonomic classification.