Proteus gland
From Tardis Wiki, the free Doctor Who reference
The proteus gland was a large gland used by some species of shapeshifters such as the Nostrovites, though Nostrovites were believed[by whom?] to have taken the gland from another species. (TV: Something Borrowed)
Behind the scenes
The proteus gland shares its name with Proteus, a shapeshifting Greek deity.
