The phrase "presents an exception" is correct and usable in written English.
It can be used when discussing a situation or case that deviates from a general rule or norm.
Example: "In most cases, the policy is strictly enforced; however, this particular situation presents an exception."
Alternatives: "offers an exception" or "constitutes an exception."
(As with many rules, Joan Rivers presents an exception: in the late sixties, she performed on "The Ed Sullivan Show" while pregnant — though she didn't mention it in her set).
Lee's (2008) recent research presents an exception.
However, the NOS-2 gene presents an exception.
There are some notable exceptions among sensory rhodopsins, as the direction of light- and dark-adaptation are reversed in ASR, which also presents an exception to the normally cyclic character of photoreactions of microbial rhodopsins.
The serpin native state presents an exception to Anfinsen's principle [ 3] as it is not the most stable form of the protein; it is a kinetically trapped intermediate whose conversion into the most stable state occurs upon proteolytic cleavage of an exposed RCL (reactive centre loop).
The original article presented an exception to one of the fundamental rules of life on Earth.
Forming a conventional modern couple with an apparently normal private life, Elsa and Clive in Splice present an exception.
Here we show that bacteria living in a single genus of feather lice, Columbicola (Insecta: Phthiraptera), present an exception to this typical pattern.
These data present an exception to the rule that functional regions of proteins generally contain the highest degree of sequence conservation.
However, P. microphthalmus presents an important exception.
In this respect, Hydra presents an interesting exception since new organisms can be regenerated from random cell re-aggregates provided by grown organisms.
