OPBMP morphogen is combined with GDNFNGF neurotrophic factors in promoting the survival or growth, or inhibiting the death or degeneration, of mammalian cells, particularly neural cells, which express OPBMP-activated serinethreonine kinase receptors and GDNFNGF-activated tyrosine kinase receptors. The rotor blade assembly includes a rotor blade having exterior surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge each extending in a generally span-wise direction between a tip and a root. In addition, in order to prevent the periodicity disturbance of realtime processing, when the processing of the non-realtime processing command is postponed, the read-ahead is continued maximally until the timestamp at which the next realtime processing command is expected to be issued. For example, the skirt can create a visual impression of a vehicle such as an automobile, truck, airplane, spacecraft, an animal or a character. The materials treated may include soil. A master hardware thread may be configured to communicate status requests to associated slave hardware threads andor hardware resources.