One source of a musky odor in perfumes is civetone, a compound extracted from the scent gland of the civet cat. Identify the functional group circled. 
Definitions:
Visual Field
The total area in which objects can be seen in the periphery while the eyes are focused on a central point.
Corpus Callosum
A thick band of nerve fibers that divides the cerebral cortex lobes into left and right hemispheres, facilitating communication between them.
Pituitary Gland
A small, pea-sized gland located at the base of the brain, crucial for regulating vital body functions and general wellbeing through the secretion of hormones.
Master Gland
A term often used to describe the pituitary gland due to its critical role in regulating various functions in the body by releasing hormones.
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