Identify the functional group: 
Definitions:
Olfactory
Pertains to the sense of smell.
Myelin Sheath
A layer of fat cells that encases and insulates most axons.
Dendrite
Extensions of neurons that receive signals from other neurons, playing a crucial role in the transmission of neural information.
Nucleolus
A small dense spherical structure in the nucleus of a cell during interphase, involved in the production and assembly of ribosomes.
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