The phrase "a parallel exists" is correct and usable in written English.
You can use it when discussing similarities or comparisons between two or more subjects, indicating that they share common characteristics or outcomes.
Example: "In both cases, a parallel exists between the strategies employed by the two companies to achieve market dominance."
Alternatives: "a similarity can be drawn" or "a comparison can be made".
Bost (2010) underlined that a parallel exists between export-oriented industrialization and the use of free ports.
Our study implies that a parallel exists in gender-specific expectations towards the intervention studied with regard to the specific cultural setting.
A parallel exists between the invention of the microscope and the development of magnetic resonance imaging (MRI), which allows new ways to explore biological systems.
The genes encoding bacterial tubulins are embedded in a completely different genomic neighborhood; however, a parallel exists with artubulins in that the tubulin genes in Prosthecobacter appear to have been inserted into a neighborhood that is partially conserved in distantly related Verrucomicrobia that lack tubulins.
But a better parallel exists, which should be getting more attention these days.
The concern I raised [ 26] about the 'communal ancestor' model was that it isn't clear on levels of selection, and, in the form presented by Woese, it seems to be predicated on naive group selection arguments (genes cooperating by default and in the absence of parasites - a clear parallel exists with the shortcomings of the hypercycle [ 34].
For example, an obvious but potentially interesting parallel exists between the observations reported here and the previously described correlation between the evolutionary rate of an individual gene and its loss rate in the course of evolution [ 1, 2].
And one final — darker — parallel exists, too: the chance that both Mr. Romney and the consulting industry have peaked.
A parallel universe exists where Frankie Cocozza got to be a member of The Libertines.
Reservoirs either in series or in parallel exist in the system.
A parallel policy exists of simply killing suspects and dumping their bodies in the tribal areas.
