A signal-detecting light-receiving device formed as an integrated circuit, which receives a light beam reflected from an optical recording medium, and which outputs a signal obtained from the received reflected light beam, through a current-output-type current amplifier circuit. The controller controls the rotation phases of the conveying roller and the discharge roller when the recording medium leaves the conveying roller before the recording medium enters the conveying roller. As a result of providing a function in which the wireless communication apparatus does not become a control station, a wireless communication apparatus which is connected to a device which cannot operate as a control station is not specified as a control station. Accordingly, in a first aspect of the present invention there is provided a method of controlling glycosaminoglycan chain length in a cell, said method comprising modifying activation of c-Abl in the cell. The devices provide for releasable yet reliable connection between the fishing-pole mount and the jigging mechanism and allow communication of movement of the jigging mechanism to be communicated to the fishing-pole mount and, thus, to the fishing line.