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Pith Protection Zone - Also now being referred to as a "Pith Plug". A sheath about the trunk pith separates the trunk pith from the branch pith. Also, at the base of the branch pith the cells appear more compact. This zone is called the pith protection zone. The cells have thicker walls in this zone, and the cells contain a higher amount of phenols. The branch pith and the trunk pith are not connected in a conducting way. Arrow points to the pith protection zone in a Norway maple.