Abstract: A system for producing and dispensing pressurized hydrogen includes: a hydrogen generator, in particular an electrolyser, a hydraulic drive, two or more hydrogen storage tanks, and a hydrogen dispensing unit, wherein each of the hydrogen storage tanks is capable of discharging hydrogen at a constant pressure by movement of an internal piston, wherein at least one of the hydrogen storage tanks is arranged to act as compressor by actuation of the internal piston by the hydraulic drive, and wherein at least one of the hydrogen storage tanks is arranged to act as a constant pressure tank for storing and discharging hydrogen at a constant pressure.

Abstract: A method of inducing tolerance to a therapeutic cell in a patient who is to be administered subsequently a therapeutic amount of the said therapeutic cell or a precursor thereof, the method comprising administering to the patient (a) a tolerising cell sharing the same antigenic characteristics as the therapeutic cell, or an antigen found thereon or a derivative of said antigen, and (b) an agent which raises the effective cAMP concentration in a monocyte cell. A method of reducing the risk of rejection of a transplant in a patient in need of transplantation of a therapeutic cell for cell or tissue regeneration, the method comprising administering to the patient prior to the transplant (a) a tolerising cell sharing the same antigenic characteristics as the therapeutic cell which therapeutic cell is, or is able to differentiate into, the cell or tissue to be regenerated, or an antigen found thereon or a derivative of said antigen, and (b) an agent which raises the effective cAMP concentration in a monocyte cell.