Morphic residue

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

Morphic residue was a viscous fluid left behind when certain species genetically re-encoded (i.e. shapeshifted).

One species known to exhibit this ability were the Vespiforms, a race of giant wasp-like creatures. (TV: The Unicorn and the Wasp)