Sink  - Source is a term meaning the position of origin of a substance.  Sink is the position where the substance finally is used or incorporated and cannot move further.  A nurse log is the source for elements and nutrients for the soil.  However the elements were part of the sink when the tree maintained a symplast.
    Source is a common term in plant physiology that indicates where a substance originates.  Sink is a term that indicates where a substance goes, and is not transported to another location.

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