user-defined upper limit for the number of target sequences returned
Alignment
region of similarity between target and query sequences
E-value
a BLAST statistic representing the significance of an alignment, values close to zero
indicate high sequence similarity with low probability of the similarity occurring by chance
Identities
the number of exact nucleotide or amino acid matches over the alignment, expressed as a fraction
and a percentage
Query Coverage
the length of the query sequence that matches the target sequence in the
alignment
Bit Score
a BLAST statistic measuring the quality of an alignment, higher values indicate a
more significant match
Span
the length of the alignment, including gaps
About Search by Sequence
Search by Sequence performs a nucleotide-nucleotide or protein-translated nucleotide BLAST search against
Addgene’s plasmid sequence database.
BLAST returns plasmids with similarity to the query sequence.
Results are sorted by E-value, a statistic from BLAST that describes the significance of a match.
Lower values are considered better matches.
FASTA headers and numbers at the beginning of each line will be removed.
The query should only contain DNA characters.
Tips for Success
Enter a distinct sequence that is an important, differentiating feature. For example, the coding region of
a gene, instead of the plasmid origin of replication.
Inspect the percent identity, query coverage, and alignment details to determine if a result match is satisfactory.
Visit the corresponding plasmid webpage to view additional details about a matching plasmid.
If no results are returned:
Try a different isoform or region of the desired sequence.
Choose a different BLAST database. Try the general “All Addgene Plasmids” (default selection),
instead of a specific database, such as “Plant Expression Plasmids”
Try selecting a different BLAST algorithm:
megablast: Designed for comparing sequences within the same, or closely related, species.
Default selection.
blastn: Designed for comparing sequences from different species. May return additional results,
if exact species match is not required.
blastn-short: Optimized for searching with shorter sequences (<= 30 nucleotides)
but can still be effective with slightly larger sequences.
tblastn: Designed for comparing protein sequences against a translated nucleotide sequence database.
Helpful for finding plasmids with codon-optimized sequences.
tblastn-fast: A faster version of tblastn that may return results more quickly, but is less sensitive
There may not be a match in our database.
You can adjust the Max Results setting on the results page from 25 to 500. If many sequences share the same top E-value,
only a truncated set of equally high-scoring matches will be shown. Set the Max Results to 500 to see more matches.
Holiday Schedule: Addgene will be closed December 24th - January 1st. Order processing will resume on January 2, 2026. For questions about estimated ship dates, please feel free to track your order status or contact [email protected].
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use to create N-terminal PelB-Twin-Strep-tag fusion proteins or dual tagged fusion with N-terminal PelB-Twin-Strep-tag and C-terminal 6x His-tag for periplasmic translocation via PelB signal sequence
Expresses either functional CRISPR gRNAs from the hU6-promotor and empowers pairing of CRISPR screens with 3' and 5' scRNA-Seq capturing by FACS-sorting on eBFP2+ without prior resistance selection
The YSD Toolkit is a collection of 34 plasmids that can be used in conjunction with the MoClo Yeast Toolkit (YTK) to optimize secretion and cell surface display of proteins of interest in yeast.
Yeast display plasmid intended for co-cultivation labeling by using designed ALFA-tag binding nanobody (DnbALFA) and expression of N-terminal fusions with Aga2p yeast agglutinin.
Ready-to-use AAV9 particles produced from pZac2.1-GfaABC1D-lck-jGCaMP8f (#176759). In addition to the viral particles, you will also receive purified pZac2.1-GfaABC1D-lck-jGCaMP8f plasmid DNA.
GfaABC1D-driven expression of membrane-bound calcium sensor GCaMP8f. These AAV preparations are suitable purity for injection into animals.
Plasmid to clone recombination arms to create homologous recombination donor vector for C-terminal gene tagging with NanoLuc and selection with Puromycin