A pressure relief valve system for use in a downhole operation may include a pressure relief valve configured to relieve pressure from high pressure tubing extending between a pump and a wellhead, and may include a sensor operably disposed to detect pressure in the high pressure tubing. The method employs the effect of strong fluorescence change in thin films of aggregated porphyrins. Also disclosed are radioprotective compositions that include a first radioprotective agent and a second radioprotective agent, where the first radioprotective agent is a reduced folate. The flash memory module is configured to, in response to receiving the flash memory read request, provide the information corresponding to the address to the memory controller module. In addition, the invention combines the leak FIFO and desynchronizer FIFO into a single FIFO with an effective write pointer. Also provided herein are vectors and host cells comprising those nucleic acid sequences, chimeric polypeptide molecules comprising the polypeptides of the present invention fused to heterologous polypeptide sequences, antibodies which bind to the polypeptides of the present invention and to methods for producing the polypeptides of the present invention.