Detection of Texas Red-labelled STAT-1 consensus decoy oligodeoxynucleotide (ODN) after intra-articular administration. (a) Mice were sacrificed 1 h post injection. Internalisation of the labelled STAT-1 decoy ODN as judged by laser scanning microscopy was observed in the synovium region. Untreated control knees did not show any fluorescence signal (not shown). (b) Hematoxylin-eosin stained section of the same region in the knee joint: joint space between patella (p) and femur (f); articular cartilage (c); synovium (s).