The phrase "a single exception is" is correct and usable in written English.
It can be used when you want to highlight one specific case that differs from a general rule or statement.
Example: "In most cases, the policy applies to all employees; however, a single exception is made for those on parental leave."
Alternatives: "one notable exception is" or "an individual exception is".
What I'm saying is that the cast, with only a single exception, is strong.
A single exception is an early study where 33 (94 %) of 35 men were M. genitalium negative after doxycycline treatment [ 51].
A single exception is the very early embryo (0 1 h) of D. melanogaster, which is consistent between replicates (supplementary fig. S1, Supplementary Material online), but correlates slightly better with the 4 6 h embryo of D. virilis than the blastoderm stage.
A single exception was observed in a small subgroup of men with no gray hair".
Based on a computer simulation of the sun's interior, solar scientists warned today that in 6 years the activity of dark spots on the surface will, with a single exception, be greater than it has been at any point since 1880.
Interestingly, among the 64 statistical comparisons made between the two haplotypes in this study which showed no statistically significant differences in production of a variety of cytokines, a single exception was observed — that amongst children with prior bronchiolitis.
The pre-1975 sameansmeans, with a single exception, were significantly lower than both control means.
A single exception was a trial by Nguyen, the smallest of the studies that is limited to a single center.
A single exception was observed in Lake Garda, where A. fallax individuals have a higher number of gill rakers (between 56 and 64), as previously described [ 21].
In sum, our recreation experiments show that the putative causal alleles, with a single exception, are both necessary and sufficient to produce the evolved phenotype.
Among these genes, those involved in ribosome biogenesis, with a single exception, were expressed at top three quartiles and the majority of them (94 genes) were ranked at top quartile.
