The phrase "are characterized by functional" is correct and usable in written English.
It can be used when describing the features or qualities of something, particularly in a formal or academic context.
Example: "The species are characterized by functional adaptations that allow them to thrive in extreme environments."
Alternatives: "are defined by functional" or "exhibit functional characteristics".
1) Functional domains are characterized by functional independence, and form units sufficient for a certain, mainly enzymatic, activity.
All strokes in the VBB are characterized by functional changes on the part of the brain stem structures predominantly at the pontomedullary and pontomesencephalic levels.
Shoulder complaints are characterized by functional disability, most often due to shoulder pain or to restricted range of motion in the shoulder.
While reproduction is quite equally shared among nestmate queens in most populations from boreal Eurasia (low skew), colonies from populations at the edge of the species' range are characterized by "functional monogyny," i.e., high skew.
Proteins and their encoding genes can be characterized by functional attributes, such as which pathways they act in or what molecular functions they have; structural attributes, such as lengths of their coding regions or UTRs and GC contents; and evolutionary attributes, such as substitution rates between species and estimates of selection pressures.
Self-excitation obtained in laminar lifted propane free-jet flames diluted with nitrogen was characterized by functional dependencies of the Strouhal number with related parameters.
Aging is a natural biological phenomenon, which is the inevitable fate of all living organisms and is characterized by functional decline of different vital parts of the body including the immune system.
Functional imaging studies demonstrate that depression is characterized by functional disconnection between frontal and limbic regions.
Infection by the human immunodeficiency virus (HIV) is characterized by functional impairment and chronic activation of T lymphocytes, the causes of which are largely unexplained.
Three envelope sequences from the thymus, for which the two algorithms gave discordant results, were characterized by functional analysis with single-cycle, Env-pseudotyped viruses [9].
The immortalized cell line is characterized by functional tight junctions and an active ion transport.
