Final answer:
The provided question seems mistakenly to inquire about managing physical aspects of the neurotransmitter GABA, which is a chemical rather than a physical entity. Relevant research explores the detection and regulation of GABA through methods like microdialysis in laboratory settings.
Step-by-step explanation:
The question seems to be related to the management of Gamma-Aminobutyric Acid (GABA) with a diameter of less than 5 cm. However, there appears to be a confusion in the question as GABA is a neurotransmitter, not something that has a physical diameter that can be measured. The proper context of this might relate to research or clinical studies concerning the regulation of GABA neurotransmission within the central nervous system.
Research like that cited from Synapse indicates that methods such as microdialysis can be used to study the detection and regulation of GABA within specific regions of the brain, like the ventromedial thalamus, in awake rats. Other studies suggest roles for GABA in various physiological and pathological processes, including its role in Parkinson's disease, epilepsy, cerebral ischemia, and its interaction with microglia within the central nervous system.