"Non-redundant nucleotide" "-db nt"
                "RefSeq Gene" "-db refseqgene"
                "RefSeq RNA" "-db refseq_rna"
                "Human Genomic - RefSeq Human chromosomal" "-db human_genomic"
                "RefSeq Genomic" "-db refseq_genomic"
                "Human Genomic plus Transcripts" "-db human_genomic_transcript"
                "Mouse Genomic plus Transcripts" "-db mouse_genomic_transcript"
                "Representative Genomes" "-db Representative_Genomes"
                "Other Genomic - RefSeq non-human chromosomal seqs" "-db other_genomic"
                "Vector" "-db vector"
                "Patented Nucleotide" "-db patnt"
                "Nucleotide sequences from PDB 3D nucl. acid structures" "-db pdbnt"
                "16S Microbial" "-db 16SMicrobial"
                "Environmental - Nucleotide" "-db env_nt"
                "Expressed Sequence Tags" "-db est"
                "Expressed Sequence Tags - Human" "-db est_human"
                "Expressed Sequence Tags - Mouse" "-db est_mouse"
                "Expressed Sequence Tags - Other" "-db est_others"
                "Sequence-Tagged Sites" "-db sts"
                "Genome Survey Sequences" "-db gss"
                "Genome Survey Sequences - Annotation" "-db gss_annot"
                "High Throughput Genomic Sequencing" "-db htgs"
                "Transcriptome Shotgun Assembly nucleotide" "-db tsa_nt"