  The existence of a shallow or virtual tetraquark state, $cc\bar{u}\bar{d}$,
is discussed. Using the putative masses for the doubly charmed baryons
($ccu/ccd$) from SELEX, the mass of the $cc\bar{u}\bar{d}$ state is estimated
to be about $3.9 GeV$, only slightly above the $DD^*$ threshold. The
experimental signatures for various $cc\bar{u}\bar{d}$ masses are also
discussed.
