Bio-ink Formulations for BMP2 and Inhibitors. The purpose here is to determine the concentration and to provide initial validation of patterned inhibition response. FGF2 bio-inks will be prepared. All bio-inks will be diluted to a 10 µg/ml. Since the number of binding sites on a square is fixed, the bio-ink dilutions and/or number of overprints may be modified based on initial results to accommodate multiple growth factors now occupying a given square. From the above array studies the investigators will determine the concentrations of BMP2 and inhibitor necessary to show stimulation/inhibition.