Morphic residue

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The Doctor shows Donna a morphic residue. (DW: The Unicorn and the Wasp)

Morphic residue was a viscous fluid left behind when certain species genetically reincode (shapeshift). One species known to exhibit this ability were the Vespiforms, a race of giant wasps. It is unknown how or from where the residue is produced. (DW: The Unicorn and the Wasp)