"unprecedented within" is a correct and usable phrase in written English.
You can use this phrase to describe something that has never happened before in a particular context. For example, "This year's budget includes an unprecedented within the military increase in spending."
Although strain divergence upon transmission of BSE/vCJD agent to mice was reported to occur in earlier studies [16], [24], it was unprecedented within a context of homotypic transmission, i.e. full matching between the donor and receiver PrP sequences.
Our estimation of 3' and 5' UTR divergence is unprecedented within the genus Sebastes.
Extreme variability in TIR length is not unprecedented within a given superfamily of DNA transposons (e.g., Marquez and Pritham 2010).
We had previously detected Sema3A mRNA in active MS lesions [ 54], but now describe little protein expression, and this discrepancy is not unprecedented within the brain, as PMP22 mRNA is expressed in oligodendrocytes, but no PMP22 protein is present [ 22].
The first study in 68 female cancer survivors 41 found unprecedented within-patient improvements in quality of life as measured by the Functional Assessment of Cancer Therapy (FACT) scale and the Short Form 36 (SF-36).
It is virtually unprecedented that within two and a half weeks of a disaster of this scale, with this level of devastation and these logistical challenges, that a mass vaccination campaign is already rolling out," says Dr. Julie Hall, WHO Representative in the Philippines.
By some projections, India's financial capital, Mumbai, will experience "unprecedented heat" within the next two decades.
And yet this quintessential British team has retained an almost unprecedented popularity within the usually bitter paddock.
The attack last December sparked outrage across the world and an unprecedented debate within India about the position of women.
Facing what appeared to be an unprecedented rebellion within his own Freedom People (PdL) party, on Tuesday night Berlusconi had told loyalists to vote against the confidence vote.
There is unprecedented volatility within the stock market, as the Dow Jones industrial average plunges while the Nasdaq composite zooms, or vice versa.
