Note also the attribution of isospin I=1/2 to the three lightest structure masses. 

We conclude that the growing number of coherent indications reinforces the evidence for the genuine existence of these structures. These structures are clearly exotic since there is no room for them in the qqq configurations [1], since their width is smaller than the widths of ”classical” PDG [2] baryonic resonances, and also since some masses lie below the pion threshold mass. They are naturally associated with precursor quark deconfinement and may show that the quark and gluon degrees of freedom are effective even at very low energy and must be taken into account. 

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