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the outermost nucleated cytoplasmic layer of the Schwann cells that surrounds the axon of a neuron. It forms the outermost layer of the nerve fibre in the peripheral nervous system.
the cartilaginous flap at the top of the mammalian trachea, which closes off the entrance to the...
plastids responsible for pigment synthesis and storage. They mainly contain carotenoids, but can...
hormone produced by the pancreas, which catalyses the conversion of glycogen to glucose.