One embodiment of the present invention provides a system for facilitating social networking based on fashion-related information. Catheter forceps for obtaining a tissue sample are also provided, including a catheter, a sampling chamber positioned at a distal end of the catheter and having a movable cover, and an actuation mechanism for moving the movable cover to an opened position by providing a fluid to the actuation mechanism and to a closed position by providing a vacuum to the actuation mechanism. The transmission channel is automatically adapted for the data exchange to the type of terminal and the type, for example, quantity, of data to be transmitted, by an administrator that is allocated to the network. The impurity concentration peaks of the second semiconductor region include a third, a fourth, and a fifth impurity concentration peak.