A video encoding control method for controlling encoding of an input video signal. The present invention provides a new human cytokine receptor designated as Zcytor21. With each increment of the frame counter, the cable modem’s minislot counter advances by an amount equal to the number of minislots per frame. The device also includes a guide base slidably coupled to the sliding portion, the guide base being adapted to be mechanically coupled to the intermediate coupler so as to secure the flex connector to the guide base before the sliding portion is coupled to the base portion. An opening area SE of the exhaust valve is set so that a ratio of SE to an opening area SI of the intake valve meets a relation of:0.