The finding that Dickkopf1 is a dual function protein demonstrates a mechanism for the coordination of cell migration and antagonism of Wnt\u03b2-catenin signaling during developmental and pathological processes. The receiving loudspeaker has an inverse transforming device for inverse transformation of the received modulated ultrasonic signals into inverse-transformed audio signals and for acoustic radiation of the inverse-transformed audio signals. The memory assembly is in communication with the memory bus and includes instructions for receiving an error code correction word in multiple packets via the memory bus.