The phrase "a unique exception is" is correct and usable in written English.
It can be used when introducing a specific case or situation that deviates from a general rule or norm.
Example: "In most cases, the policy applies to all employees, but a unique exception is made for those with long-term medical leave."
Alternatives: "a special case is" or "an unusual exception is".
A unique exception is the X haplogroup, which has a widespread global distribution without major regions of distinct localization.
In fact, a unique exception is the Trpc4ap gene that was earlier related as conserved near miR-499 and Myh7b host gene from fish to mammals [ 37].
A unique exception is the Wadi Shebelle that originates in the highlands of Ethiopia, flows south through the Ogadan plateau of Ethiopia and Somalia and discharges into the Indian Ocean.
A unique exception is the low urinary excretion of MMA among indigenous populations in the Andes, including residents of the Argentinean village of San Antonio de los Cobres (SAC) (Hopenhayn-Rich et al. 1996; Vahter et al. 1995).
An interesting and unique exception is jojoba (Simmondsia chinensis) which accumulates seed oil in form of wax esters, esters between a fatty acid and a fatty alcohol.
The unique exception was for C. fetus subspecies, that are phylogenetically closer to putative pathogens but have an expanded repertory of virulence genes as expected for established pathogens.
The unique exception was for C. hominis, which clustered closer to genital species despite being gastrointestinal; this species carried an extremely reduced virulence genes repertory and posed the lowest number of documented infections.
"One of the few, almost unique, exceptions is match-fixing".
RUNX1 is a unique exception to this in that it is specifically overexpressed in t(4 11) leukemias.
They agree that a) since wiretapping is legal under court supervision, so will "back-door" access to social media communications, and b) Gov. Jindal's release of aging criminals is just and fiscally smart (with Bernie Madoff being a "unique exception" says the Sheriff of Wall Street).
Bakers don't usually have groupies, but Peter Klann is a unique exception.
