The invention relates to a programmable logic device comprising several logic blocks with configurable characteristics, elements for linking the logic blocks to one another and a processing unit and an inputoutput unit. The method of producing hyaluronic acid comprising obtaining hyaluronic acid by co-expressing a protein with hyaluronic acid synthase activity and an exogenous protein with sugar-nucleotide synthase activity in a plant cell or a plant is provided. The steering wires may be configured at one end to control the movement of at least a portion of the distal portion of the catheter and at the other end for connection to a control member. The platen supports an optical view-port assembly for assisting in determining a thickness of a layer of the substrate.