Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
at locus
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "at locus" is correct and can be used in written English, particularly in legal or academic contexts.
It is typically used to refer to a specific location or place, often in discussions of law, geography, or scholarly work. Example: "The evidence was found at locus, which was crucial for establishing the timeline of events."
✓ Grammatically correct
Science
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
A nitrogen regulatory protein P-II (glnK) that is sensitive to nitrogen concentrations, encoded at locus tag H16_A0320 of the C. necator H16 genome was highly up-regulated.
Science
We present here a novel variant at locus D1S1656 showing a molecular length of 211.32 bp corresponding to 21.3 repeating units.
The information gathered in this study lays the foundations for rationalising the notably different potency and pharmacological profiles of Dendroaspis venoms at locus resolution.
Science
A sequence was found shared by TRD2 at locus 1 (MAGa6280) in strain 5632, TRD1 at locus 3 (MAGa6340) in strain 5632, and TRD2 at locus 1 (MAG5640).
Science
Least significant difference is shown by Adi Padam with Adi Pasi-Lower (at locus D2S1338) and Adi Komkar (at locus D7S820).
Science
With respect to the LTR insertion at locus GQ468821, all the An.
Science
The A11812G variant exists at locus 351 of codon 3 of MT-ND4.
Science
At locus 2, domain e appears to have moved between TRD1 and TRD2.
Science
Additionally, three new alleles were also identified by this study, all at locus tpi.
Science
For example, if the P1 allele at locus A adds 5 units to the phenotype but the P1 allele at locus B reduces the phenotype by 5 units, LCA will not detect this zero net additive difference between parents.
Science
Within the inversion at locus 2110, diversity was reduced nearly 19-fold on inverted versus standard chromosomes.
Science
Expert writing Tips
Best practice
Use "at locus" when precision in identifying a specific genetic location or point of interest is required in scientific or technical writing.
Common error
Avoid using "at locus" when a general area is meant. Instead, use phrases like "in the region" or "nearby" to prevent miscommunication.
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "at locus" functions as a prepositional phrase specifying the location of something, especially in scientific contexts. Ludwig confirms its grammatical correctness and frequent use in academic literature.
Frequent in
Science
100%
Less common in
News & Media
0%
Formal & Business
0%
Academia
0%
Ludwig's WRAP-UP
In summary, the phrase "at locus" is a grammatically sound prepositional phrase commonly used in scientific and technical writing to specify a precise location, particularly in genetic or physical contexts. As Ludwig confirms, this phrase is correct and frequently found in academic papers. While it is suitable for formal, scientific communication, alternatives like "at the site" or "at the location" may be used for broader audiences. Its prevalence in scientific sources indicates its importance in maintaining accuracy and clarity in research and technical documentation.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
at the site
Replaces 'locus' with 'site,' a more general term for a location.
at the location
Substitutes 'locus' with 'location,' providing a common and easily understood alternative.
at the position
Emphasizes the specific placement or arrangement of something.
in the region
Refers to a broader area instead of a precise point, which can be suitable in some contexts.
in situ
A Latin term meaning "in its original place," often used in scientific or technical contexts.
on site
Implies being present or occurring at a specific place.
at the point
Highlights a precise spot or moment, potentially adding clarity in certain uses.
in that area
Refers to a less defined spatial context, suitable when precision is not necessary.
where it is situated
Replaces the phrase with a more descriptive clause indicating placement.
at that juncture
Uses 'juncture' to refer to a specific point or location, often in a more formal context.
FAQs
How is "at locus" typically used in a sentence?
The phrase "at locus" is typically used to specify a location, especially in scientific and technical contexts. For example, "The mutation was found at locus X."
What can I say instead of "at locus" to sound less technical?
Depending on the context, you can use alternatives like "at the site", "at the location", or "in that area" to reduce the technical tone.
Which is correct, "at locus" or "in locus"?
"At locus" is the correct prepositional usage. "In locus" is not standard English.
In what kind of writing should I use "at locus"?
Use "at locus" primarily in scientific papers, genetic studies, or technical reports where specifying a precise genetic or physical location is important.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested