The phrase "may exist within" is grammatically correct and can be used in written English.
It is typically used to describe something that is possibly present or found within a larger entity or system. Example: "In certain cultures, strict gender roles may exist within traditional family structures."
Mesoregions also may exist within existing states and as collaborative ventures between subregions of geographically adjacent states.
Similar moons may exist within the Huygens and Maxwell gaps.
Thus, multiple independent evolutionary units that perhaps represent distinct species may exist within the Gray-headed Tanager.
Thus, functional subgroups may exist within the GnRH system with considerable overlap in the input to these cells.
They recall a zoning regulation reading, "no drinking saloon may exist within a mile of any schoolhouse".
"Of equal concern is the perception that a climate may exist within the athletic department that discourages victims from reporting crimes".
This is a somewhat more advanced model and demonstrates the multiplicity of size of porosity that may exist within a porous carbon from micro to macroporosity.
Some scientists have suggested that life may exist within this ocean, living off minerals and using tidal heat as a source of energy.
Group-based trajectory modeling, in contrast, is designed for heterogeneous populations and as a result is able to identify atypical patterns of change over time that may exist within a population.
Many thousands of these algae may exist within a single protozoan, and a significant amount of the products of photosynthesis (e.g., glucose, alanine, maltose) are transferred from the algae to the protozoan.
Defects in the interventricular septum, the partition that separates the lower chambers of the heart, may be small or large, single or multiple, and may exist within any part of the ventricular septum.
