In a sensor network system, sensor data having a high precision is collected, and congestion of a communication network and an apparatus for processing the sensor data is suppressed. The write head has a non-magnetic step layer and a non-magnetic bump formed on the front edge of the magnetic step layer. This increase occurs along either a transition or contact portion of the ground terminal. One claim recites: embedding an N-bit code with a source signal, N being at least one. Also within the scope of the disclosure are recombinant vectors, recombinant host cells, methods of screening for modulators of nNR1, nNR2 andor nNR2-1 activity, and production of antibodies against nNR1, nNR2 andor nNR2-1, or epitopes thereof. The apparatus comprises a laser source operable to generate a laser beam having a flux that exceeds a predetermined value and an optical train operable to modify the beam such that the flux of the beam through a predetermined aperture does not exceed the predetermined value.