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The phrase "a positive control" is correct and usable in written English.
It is typically used in scientific contexts, particularly in experiments, to refer to a group or sample that is expected to produce a positive result, serving as a benchmark for comparison.
Example: "In our experiment, we included a positive control to ensure that our results were valid and reliable."
Alternatives: "a known positive control" or "a control sample with expected results".
Exact(60)
H2O2 was used as a positive control.
Taxol was used as a positive control.
TNF+ZVAD (TZ) as a positive control.
Amphetamine was included as a positive control.
BAT of Ctrl mice was used as a positive control.
The NRE probe was used as a positive control.
The input, mitochondrial lysate, was used as a positive control.
RPL13A (orange) was used as a positive control.
Gapdh mRNA was used as a positive control.
100% ethanol was used as a positive control.
C. resistens DSM 45100 was used as a positive control.
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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