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The phrase "and a upon" is not correct and usable in written English.
It appears to be a combination of words that does not form a coherent or grammatically correct expression.
Example: "He was standing and a upon the hill." (This does not make sense.)
Alternatives: "and upon" or "and a" (depending on intended meaning).
Exact(1)
This was paralleled by a marked downregulation of cyclins E and A upon SMIP004 treatment.
Similar(59)
Firstly, it divides Interest packets into B-Int and A-Int upon different functions.
As Mark Twain famously observed, "The jury system puts a ban upon intelligence and honesty, and a premium upon ignorance, stupidity and perjury.
/ She gives his cheek a pat, / and a kiss upon his little nose / just like that".
He offers solid protection and a platform upon which the team builds their attacks.
Building a life and a community upon principles that ignore such realities is doomed to fail.
Sigmar Gabriel, the SPD leader and economy minister, calls the gap "drastic" and "a shame upon Germany".
Compromise, however, is one of the grand traditions of our democracy, and a foundation upon which this nation was built.
And a second upon oligomerization followed by the final conformational change when the pore is formed?
One implies unquestioning loyalty; the other entails democratic participation and an insistence upon upholding the ideals that the country represents.
Items were grouped into domains, and an agreed upon list of medication-prescribing competencies was created.
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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