A polytetrafluoroethylene porous body which is produced by molding a polytetrafluoroethylene mixture, including a polytetrafluoroethylene powder and a pore-forming agent, into a predetermined shape, and subsequently removing the pore-forming agent. A heater element 10 disposed in each bubble forming chamber 7 to heat printing fluid 11 to a temperature above its boiling point to form a vapour bubble 12 that causes the ejection of a drop 16 of the printing fluid through an ejection aperture 5 in each nozzle 3. The steps of aggregating adjacent OPCA outputs and applying OPCA to the aggregated values are performed one or more times for extracting low-dimensional noise-robust features from signals, including audio signals, images, video data, or any other time or frequency domain signal. For each PCP flow received via the physical MAC port associated with a port enqueue engine, the port enqueue engine causes frame data of the flow to be loaded into one particular linked list of buffers. The pharmaceutical composition can be administered to a patient as a liquid, and gels after administration into a sustained release drug delivery system from which the biologically active botulinum toxin is released over a multi-day period thereby localizing the drug as a depot and controlling release to enhance the therapeutic effect per dose. The encrypted content data is transferred to the storage media or the like depending on the user’s specification.