Fluorescently labeled mesenchymal stem cells (MSCs) maintain multilineage potential and can be detected following implantation into articular cartilage defects. - Quintavalla,J.; Uziel-Fusi,S.; Yin,J.; Boehnlein,E.; Pastor,G.; Blancuzzi,V.; Singh,H.N.; Kraus,K.H.; O'Byrne,E.; Pellas,T.C. (Biomaterials, 2002)