HLA-DM and invariant chain are expressed by thyroid follicular cells, enabling the expression of compact DR molecules. - Catálfamo,M.; Serradell,L.; Roura-Mir,C.; Kolkowski,E.; Sospedra,M.; Vives-Pi,M.; Vargas-Nieto,F.; Pujol-Burrell,R.; Jaraquemada,D . (Int Immunol, 1999)