Samples used in tests were originaly downloaded from: 

* SILVA 132 LSURef 
https://ftp.arb-silva.de/release_132/Exports/SILVA_132_LSURef_tax_silva.fasta.gz

* SILVA 132 SSURef 
https://ftp.arb-silva.de/release_132/Exports/SILVA_132_SSURef_tax_silva.fasta.gz
    
* H. sapiens GRCh38 peptides all
ftp://ftp.ensembl.org/pub/release-96/fasta/homo_sapiens/pep/Homo_sapiens.GRCh38.pep.all.fa.gz

* PDB
ftp://ftp.ncbi.nih.gov/blast/db/FASTA/pdbaa.gz

* UniProtKB Reviewed (Swiss-Prot)
ftp://ftp.uniprot.org/pub/databases/uniprot/current_release/knowledgebase/complete/uniprot_sprot.fasta.gz

* Influenza
ftp://ftp.ncbi.nih.gov/genomes/INFLUENZA/influenza.fna.gz
   
* Mitochondrion 1
ftp://ftp.ncbi.nlm.nih.gov/refseq/release/mitochondrion/mitochondrion.1.1.genomic.fna.gz