"in the expression" is correct and usable in written English.
You can use it to refer to a phrase or mathematical expression. For example, "The variable x is used in the expression x2 + 3x + 5."
I want agony in the expression and in the clothes.
There's a physicality in the expression of emotion".
As for Piaf, her aesthetic consisted in the expression of emotion in popular song.
("Matter" is linked to "mater", or mother, remembered in the expression, mother earth).
What you call hammy is actually an excitement in the expression of acting".
Yet in the expression without fail, they accept the noun fail exactly as the phrase describes.
There is considerable variation in the expression of severe preeclampsia.
All known modules were then filtered for the genes present in the expression matrix.
Furthermore, the changes in the expression profile correlate to the results of viability assays.
Next, we determined the role of Perk in the expression of Chop in CD8+ TILs.
Among these candidates, changes in the expression level of Lrrc75a-as1 influenced calcium deposition in VSMCs.
