The phrase "a second region" is correct and usable in written English.
It can be used when referring to an additional area or zone in a discussion or analysis, often in contexts like geography, science, or data analysis.
Example: "In our study, we observed significant differences between the first region and a second region that was previously unexplored."
Alternatives: "an additional area" or "a different zone".
Using modern genetic screening techniques, they then located two interacting gene regions causing 'Type 1' necrosis, and one implicated in 'Type 2'; a second region remains to be identified.
Near the interface between the polymer and the electrolyte, a second region which is electrically disconnected from the electrode surface, prevents anodic reoxidation of the catalyst, allowing the doubly protonated Ni0 complex to reduce incoming O2 to water.
Sequence analysis showed a high degree of identity among Ebola Zaire, Sudan, Reston, and Cote d'Ivoire subtype viruses in their 3′ and 5′ termini (18 nucleotides in length) and within a second region (internal by approximately 20 nucleotides).
The mean temperature field indicated two distinctive regions at early axial distances, the first of a lower central flame temperature and a second region of a higher flame temperature, which located at a shifted radial distances.
The company has long said that a second region on the U.S. West Coast was in the works, after all.
A second region of interest was placed over the upper mediastinum [13].
A second region (-74/-66) is identocal thethe sterol response element consensus and specifically binds ADD1/SREBP1.
In addition, the company plans to add a new region in India, a second region in China and a new one in Ohio in 2016.
At the same time, WHO said phase 6 was "imminent" and would be declared if the same type of spread appeared in a second region of the world.
The scatter plot in Figure 10c indicates also a second region where relatively high values of the sensitivity occur for positive values of the LE.
While Amazon's Irish data center has a pretty good track record with regard to availability (even though it's not perfect, either), having a second region to fall back on will give businesses an extra degree of redundancy.
