The invention provides full-length, human isolated nucleic acids molecules, designated MEKK1 nucleic acid molecules, which encode a MEKK family member. The distal end of the joint is installed with a threaded section. The packing and unpacking methods are implemented such that the temporal offset between elementary streams carried within relatively low bitrate information stream is removed, i. The calling modem analyzes the signal received in response to the modified answer tone to determine whether characteristics of the current channel are similar to stored characteristics associated with a previous connection over the same channel. This action allows pressure gas to pass through the ports and ducts to inflate the membrane.