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the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from an electrically insulating substance called myelin and helps to increase the speed by which nerve impulses travel along the nerve.
produced, growing, living, or occurring naturally in a particular region or environment.
undifferentiated cells found in almost all organisms that have the ability to develop into any...
organelles that only occur in the green parts of plants. They contain the green pigment...