The phrase "a single expression of" is correct and usable in written English.
It can be used when referring to one specific way of conveying an idea, feeling, or concept.
Example: "The poem is a single expression of love and longing that resonates with many readers."
Alternatives: "a solitary representation of" or "a unique manifestation of".
So, not a single expression of bitterness?
Then they allowed themselves a single expression of feeling: "This result leaves us with the deepest concern".
It was becoming absolutely impossible, in fact, or at least much, much harder, to claim that there was a single expression of religious truth to which the English nation could consensually subscribe.
The review board's report on the causes of the crisis said that board members could not find a single expression of outrage in church correspondence from a supervising bishop about any priest that the bishops knew had been accused of abuse.
"You never hear a single expression of support or interest or validation from any politician, despite the fact that the 'creative industries' – as they're called by politicians – are about the healthiest export that the country has.
Given the complex control of many brain functions, subjective experience of mood as a single expression of integrated functions has a special value.
Children successfully used a process of elimination to match a single expression to one of several labels (Study 1) and to match a single label to one of several expressions (Study 2).
The unified model has a single expression and a maximum of six variables/parameters, whereas in most cases, three to four parameters are sufficient.
Thus, an alternative way of calculating a single expression level for each protein had to be used.
However, within the TInt subset of dCD8+ T cells, a higher proportion demonstrated dual or single expression of PD-1 and Tim-3.
