A number of soluble engineered forms of MGLL that are suitable for high-throughput screening and protein crystallization, as well as a crystallized form of monoacylglycerol lipase protein and descriptions of the X-ray diffraction patterns are disclosed. The ultrasound power transmitter activates a set of transmit ultrasonic transducers in close proximity of an electronic device to be arranged to beam ultrasound energy to the electronic device. In one implementation, label imposition is divided between ingress and egress linecards so that the interface supporting a given service can be the one to impose any needed corresponding label. A page, that otherwise would be the target of a write operation, is not written if any of the pages in its risk zone contain data that could be corrupted if the write operation is interrupted.