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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10xQUAS effector expressing CsChrimson.mVenus for red-shifted optogenetic activation of neurons; Contains both P-element ends and attB integration sequence
Plasmid for CRISPR-mediated knock-in line that expresses the activation domain of QF by knocking-in a T2A-QF-AD fragment replacing the stop codon of the endogenous Aedes aegypti Ir25a gene
Coexpresses human POT1 with a zz affinity tag, YBBR site, and TEV site, human TRF2 with a zz tag and TEV site, and human TIN2 and TPP1 each with an MBP affinity tag and TEV site in insect cells
aka PRE-Hsp70BbCas9 or 2gypsyPRE-Hsp70Bb-Cas9-T2A-eGFP; heat-shock inducible Cas9-T2A-eGFP expression regulated by upstream Polycomb response elements with two gypsy insulator elements. Final product
"CoinFLP-Gal4" - Expresses Gal4 from actin promoter downsteam of transcriptional stop. Recombination by FLP excises FRT-FRT pair to express Gal4, or FRT3-FRT3 pair to prevent Gal4 expression