| check_fields | Internal check for fields | 
| fields_dbs | Functions to set fields for various databases | 
| filter_scores | Scores for filtering operations | 
| get_ncbi_taxonomy | Get NCBI taxonomy | 
| igraph_from_taxo | Create a graph from a taxonomic table | 
| make_ncbi_table | Parse NCBI XML and make a table | 
| ncbi_taxo_rank | Taxonomic ranks of the NCBI Taxonomy database | 
| process_geo_ncbi | Process coordinate column returned by NCBI | 
| refdb_check_seq_conflict | Check for conflicts in sequences | 
| refdb_check_seq_homogeneity | Check for genetic homogeneity of taxa | 
| refdb_check_tax_conflict | Check for conflicts in taxonomy | 
| refdb_check_tax_typo | Check for typos in taxonomic names | 
| refdb_clean_seq_crop_primers | Crop genetic sequences with a set of primers | 
| refdb_clean_seq_remove_gaps | Remove gaps from genetic sequences | 
| refdb_clean_seq_remove_sideN | Remove repeated side N from genetic sequences | 
| refdb_clean_tax_harmonize_nomenclature | Harmonize taxonomic name nomenclature | 
| refdb_clean_tax_NA | Convert missing taxonomic names to NA | 
| refdb_clean_tax_remove_blank | Remove blank characters from taxonomic names | 
| refdb_clean_tax_remove_extra | Remove extra words from taxonomic names | 
| refdb_clean_tax_remove_subsp | Remove subspecific information from taxonomic names | 
| refdb_clean_tax_remove_uncertainty | Remove terms indicating uncertainty in taxonomic names | 
| refdb_export_dada2 | Export reference database for DADA2 | 
| refdb_export_idtaxa | Export reference database for DECIPHER (IDTAXA) | 
| refdb_export_mothur | Export reference database for Mothur | 
| refdb_fill_tax_downstream | Fill missing data in taxonomy | 
| refdb_fill_tax_upstream | Fill missing data in taxonomy | 
| refdb_filter_ref_scope | Filter records by taxonomic scope of studies | 
| refdb_filter_seq_ambiguous | Filter sequences based on their number of ambiguous... | 
| refdb_filter_seq_duplicates | Filter duplicated sequences. | 
| refdb_filter_seq_homopolymers | Filter sequences based on their number of repeated character. | 
| refdb_filter_seq_length | Filter sequences based on their number of character. | 
| refdb_filter_seq_primer | Filter sequences based on the presence of primers. | 
| refdb_filter_seq_stopcodon | Filter sequences based on their number of of stop codons. | 
| refdb_filter_tax_na | Filter records NA taxa | 
| refdb_filter_tax_precision | Filter records based on their taxonomic precision. | 
| refdb_get_fields | Get fields of a reference database | 
| refdb_import_BOLD | Download and import BOLD records | 
| refdb_import_NCBI | Download and import NCBI Nucleotide records | 
| refdb_merge | Merge reference databases | 
| refdb-package | refdb: A DNA Reference Library Manager | 
| refdb_plot_map | Plot an interactive map | 
| refdb_plot_seqlen_hist | Plot an histogram of sequence lengths | 
| refdb_plot_tax_barplot | Barplots of the number of records for the most represented... | 
| refdb_plot_tax_tree | Reference database taxonomy tree | 
| refdb_plot_tax_treemap | Reference database treemap | 
| refdb_report | Compile a report with different checks | 
| refdb_sample_tax | Sample records within taxa | 
| refdb_set_fields | Associate columns to fields | 
| refdb_set_ncbitax | Replace the current taxonomy using the NCBI Taxonomy database | 
| refdb_write_fields | Write fields to a file | 
| valid_taxo_rank | Ranks considered as valid by refdb | 
| xml_extract | Extract XML elements | 
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