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The phrase "are only functional" is correct and usable in written English.
It can be used to describe something that serves a practical purpose without any additional features or aesthetics.
Example: "The tools in this workshop are only functional, designed for efficiency rather than appearance."
Alternatives: "serve only a practical purpose" or "are purely utilitarian."
Exact(16)
Combining our functional data with an analysis of the crystal structure of granzyme B suggests that the necessary motifs for granzyme B loading into lytic granules are dispersed throughout the primary amino acid sequence and are only functional when contiguous in the tertiary structure.
However, these solutions are only functional in the case of a factorized formulation form.
Many proteins are only functional after assembly into protein complexes.
This included MGEs carrying genes for proteins that are only functional in certain mammalian hosts.
In contrast, piRNAs of 24-32 nt, which are only functional in the germline, appear to be Dicer-independent and are associated with Piwi proteins[ 2].
In vitro experiments were performed with excised brain tissue and may be lacking in structural barriers that are only functional in a living brain.
Similar(44)
Pornography is only functional.
However, the search engine was only functional for 16 months.
His motto was 'Only Functional Paperclips Shall Be Sold at Paperclip World'.
Wonder is only functional if it prompts us to resolve it in the satisfaction of knowledge.
According to a Google spokesperson, the store is only functional to allow those who participated in its April 15 sale to finish their purchases.
More suggestions(17)
are only technical
are only professional
are just functional
are only operational
are only workable
are applying functional
are limited functional
are only works
are only uninsured
are only odd
are only average
are only preparatory
are only half-correct
are only mature
are only growing
are only eighty
are only controversial
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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