Disclosed are methods for regulating neurotrophin levels within a human body. The base station transmits a restriction notification signal in response to a request issued from the host. The particles have a substantially flat or flake-like morphology. A nozzle seal is removably secured to each of the flow passages on the face of the first cylindrical section. If a notification message is determined to be correlated to the paused instance, the generic wait service evaluates the exit criterion based on the status information included in the message. A precursor compound to the photoacid generator, a photoresist composition including the photoacid generator, and a substrate coated with the photoresist composition, are also disclosed.