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The phrase "a was altered" is not correct in English.
Did you mean "was altered"? You can use "was altered" to indicate that something has been changed or modified in the past.
Example: "The document was altered to reflect the new policy changes."
Alternatives: "was modified" or "was changed."
Exact(1)
The expression of some critical successive enzymes for converting 5-amino-levulinate (ALA) to chlorophyll a was altered to variable extents in ZH2.
Similar(59)
First, we tested if the location of Cenp-A was altered by truncation of the X centromere.
As the drug administration affected tumor vascularisation, we wondered whether the concentration of circulating VEGF-A was altered.
In this letter, statements regarding the functions of HPS4 and 1 have been altered from those initially published, A section of text has been inserted, a sentence was altered and a sentence was deleted.
Until the 1980s, such an attitude was altered.
In addition, a Gore/Lieberman sign was altered to read, "I'm With Stupid".
The notion of a painter's retreat was altered forever".
But, within twenty-four hours, the crucial language was altered in a unanimous vote.
This assumption was altered in a sensitivity analysis.
Everything was altered in an instant".
Earlier today, The Harvard Crimson's website was altered by an unauthorized user.
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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