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Mustard seeds come in three varieties: white, brown and black. In fact, the brown and black ones are more closely related to cabbage that to the white mustard, but let's leave the botanical taxonomy aside and just continue to refer to all three as "mustard".
Mustard seeds have been known to humanity for ages. As an example, let me quote the following simile employed by Jesusone itinerant rabbi two thousand years ago:
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