Fig. 4

Characterization of bone marrow-derived mesenchymal stem cell-conditioned medium by an antibody array. In the upper left (1–1, 1–2, and 1–3) and lower right (4–28, 4–29, and 4–30) corners, the squares correspond to positive control signals (equal amounts of biotinylated immunoglobulin G printed directly onto the array). The squares in 1–5 and 1–6 correspond to negative control spots (protein-containing buffer), and 1–4 is blank spots (meaning that nothing is printed here)