The phrase "although there exist cases" is correct and usable in written English.
It can be used to introduce a contrast or exception to a general statement, indicating that while something is generally true, there are specific instances that differ.
Example: "The theory is widely accepted; however, although there exist cases that challenge its validity, most researchers support it."
Alternatives: "even though there are instances" or "despite the existence of cases".
Although empirical studies show that the actual ligand-binding sites tend to coincide with the largest and deepest pocket on the protein's surface [5,6], there exist cases where ligands are found binding to rather exposed shallow clefts [7,8].
The results show that there exist cases where modeling a compression member with its actual postbuckling behavior, which although has some reserve load carrying capacity, are more critical than the case where the same member is considered to suddenly lose its full load carrying capacity at its buckling load.
Although there exist some relationships for the case of impinged loads on bridges exerted by regular (sinusoidal) waves, for the case of solitary waves such as tsunamis, no relation has yet been proposed in the literature.
Although there exists a case in which the CR model outperforms the IR model [34], a number of authors have recently begun to notice that the IR model is superior to the CR model in approximating the evolution of evolutionary rates in several cases [17], [35] [37].
In most cases hatt-ı humayuns were written by the Sultan himself although there exist some that were penned by the chief scribe or another functionary.
In the majority of cases, methyllysine analogues recapitulate the function of the native PTM, although there exist isolated examples where this approach falls short.
Although there exist some small falsely identified tampered regions, its size is very small.
50 To date, although there exists overwhelming data on epidemiologic studies, case control studies, and in vitro/vivo data that soy isoflavone may be a promising chemopreventive agent against PCA, there have been no published prospective randomized clinical studies with sufficient statistical power to assess whether isoflavone supplementation can reduce PCa development or delay PCa progression.
Although there exists the eerie possibility that it will remain as if nowhere – forever lost.
Most of the droplets were implanted under the projections, although there existed some droplets on film surface.
