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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallTwinStrand Biosciences raised $50 million in a 2021 Series B to expand DNA-sequencing technology designed to detect mutations that are exceptionally rare in a sample. The Seattle company was co-founded by physician-scientist Jesse Salk, grandson of polio-vaccine pioneer Jonas Salk. As of August 2026, TwinStrand still describes its platform as a research tool—not a diagnostic test—and Scantox has taken over TwinStrand’s nonclinical mutagenesis and genomic-safety business.
What TwinStrand announced in 2021
On May 6, 2021, GeekWire reported that TwinStrand Biosciences had raised a $50 million Series B led by Section 32. New investors included Soleus Capital and Janus Henderson Investors; existing investors included Madrona Venture Group, Ridgeback Capital and Alexandria Venture Investments. Section 32 partner Michael Pellini, formerly CEO of Foundation Medicine, joined TwinStrand’s board. GeekWire’s funding report said the round brought the company’s venture-capital and grant funding to about $77.9 million.
That reported total included $16 million raised in January 2020, $5.5 million in earlier seed funding and $6.4 million in Small Business Innovation Research grants. The figure is a historical total reported in 2021, not a current valuation or a measure of revenue. TwinStrand, founded in 2015 as a University of Washington spinout, said it would use the financing to expand its Duplex Sequencing platform and related research and commercial work.
Who is Jesse Salk?
Jesse Salk is a physician-scientist with an MD/PhD from the University of Washington and a co-founder of TwinStrand. GeekWire described him in 2021 as the company’s CEO and chief scientific officer, an affiliate clinical faculty member at UW and Fred Hutchinson Cancer Research Center, and a part-time physician at the VA Puget Sound. He is Jonas Salk’s grandson; Jonas Salk developed the first successful polio vaccine. The family connection is biographical context, while Jesse Salk’s relevance to TwinStrand comes from his own scientific and company-building work.
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His title later changed. In October 2022, TwinStrand announced that Salk would leave the CEO role and continue as chief scientific officer, with Chad Brown named interim CEO. The 2021 CEO title should therefore not be read as a current leadership description. TwinStrand’s leadership-transition announcement documents that change.
What does “genetic needles in the haystack” mean?
The phrase describes a measurement problem, not a special category of DNA. A sample may contain a mutation of interest in only a tiny fraction of its DNA molecules. Sequencing instruments and the laboratory steps used to prepare DNA can introduce errors; if a true variant is rarer than that background noise, researchers may struggle to tell a real mutation from a technical mistake.
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TwinStrand’s Duplex Sequencing is designed to address that problem by reading both complementary strands of an individual DNA molecule and comparing them. The logic is that a genuine mutation should be reflected in the paired-strand evidence, while an error affecting only one strand can be filtered out during consensus building. The method aims to improve confidence in low-frequency variant calls; it does not make every detected mutation clinically important or guarantee that every molecule in a sample is captured.
How Duplex Sequencing works
- Tag individual DNA molecules. Molecular identifiers preserve information about which reads came from the original DNA molecule rather than from copies made during preparation.
- Read both strands. The workflow sequences the two complementary strands of the DNA double helix.
- Compare the paired reads. A difference appearing on only one strand may be a technical error rather than a biological mutation.
- Build an error-corrected consensus. The paired evidence is used to produce a consensus sequence with one-sided errors removed or reduced.
- Analyze the data. Bioinformatics software identifies candidate variants and quality metrics for the particular assay.
This is an error-correction strategy, not simply a matter of sequencing more DNA. It uses the relationship between the two strands to help distinguish biological signal from technical noise. TwinStrand’s technology page describes an error rate reduction from roughly 1 in 100 for standard sequencing to approximately 1 in 10 million with Duplex Sequencing, and characterizes the platform as providing more than a 10,000-fold increase in sensitivity compared with standard next-generation sequencing. Those are company-reported performance claims; they should not be treated as universal results for every assay, sample or laboratory workflow.
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What the technology was intended to make possible
In 2021, TwinStrand’s potential applications included cancer research, detection of cancer cells that persist after treatment, recurrence monitoring, measurable residual disease (MRD) research, and monitoring advanced cellular immunotherapies. The same ability to detect low-frequency mutations could also support research into cancer evolution and subclonal mutations. In toxicology, mutation-frequency and mutation-spectrum data may help researchers assess whether a chemical or medicine causes genetic damage, potentially reducing reliance on some time-consuming animal toxicity tests.
These are distinct stages of evidence, not interchangeable claims. A possible application is not necessarily a marketed service; a commercial research service is not automatically a validated clinical test; and analytical sensitivity alone does not establish that a result improves patient care. GeekWire reported that TwinStrand had launched commercial products in 2020 and had a partnership with Foundation Medicine to incorporate the technology into liquid-biopsy analysis. That is a historical report of a partnership at the time, not confirmation that the arrangement remains active today.
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What TwinStrand offers now—and what it does not
As of August 2026, TwinStrand’s website presents Duplex Sequencing kits and services, customizable assays, cloud-based bioinformatics, and research applications including AML minimal residual disease and genetic toxicology. Its materials describe research work in hematological cancers and other areas, and offer assay development for projects that may not fit an off-the-shelf design. The company’s current technology page explicitly says its kits and services are for research use only and are not for diagnostic procedures.
That restriction matters for patients and buyers: the listed research offerings should not be presented as an approved test for diagnosing cancer, detecting cancer early in routine care, or directing an individual patient’s treatment. TwinStrand provides no public price list on the reviewed technology page; prospective research customers are directed to contact the company. Assay scope, sample type, sequencing depth and analysis needs can differ by project, so a public consumer-style price comparison is not available.
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What changed in 2026: Scantox took over the mutagenesis business
On February 26, 2026, Scantox announced a technology-transfer and license agreement covering TwinStrand’s DuplexSeq mutagenesis and nonclinical genomic-safety business. Scantox says it became the sole global provider of those assays and related nonclinical services. TwinStrand’s mutagenesis page directs visitors to Scantox for that business. This is a transfer of a specific business line; the announcement does not establish that Scantox acquired TwinStrand as a whole.
For a researcher or company seeking mutagenesis or nonclinical genomic-safety testing, the relevant provider is now Scantox. Its announcement of the transfer describes the transferred services. No public pricing is stated there, so a quote would depend on the study and service requirements.
What the funding does—and does not—tell you
A $50 million financing round showed that investors were willing to fund TwinStrand’s attempt to commercialize rare-variant sequencing and expand its applications. It was not proof that the technology had improved patient outcomes, that early-cancer detection was available to consumers, or that the platform had displaced established diagnostics. Those questions require evidence beyond a financing announcement, including assay-specific analytical and clinical validation and, where relevant, regulatory authorization.
For researchers evaluating the approach, the practical fit depends on the question being asked: whether the goal is rare-variant detection, mutation-spectrum analysis, or longitudinal MRD research; the minimum variant frequency of interest; the amount and condition of DNA; and whether a targeted or custom assay is suitable. Error correction cannot recover molecules that were not present in the sample, were too degraded to analyze, or were not adequately represented in the workflow. Deeper sequencing and specialized preparation may also add operational cost and time, although TwinStrand and Scantox do not publish standard prices on the cited pages.
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