A decoder and a method for preventing and correcting a fluctuated image which occurs due to a user’s fluctuated hand when recording using a mobile image communication system by adapting a digital image stabilization technique in a video decoder are provided. One embodiment of the transaction may be directed to a transaction apparatus and a method including receiving an authentication code from a consumer, sending the authentication code to a first server computer, wherein if the received authentication code matches a generated authentication code, the first server sends a confirmation message. The invention further relates to diagnostic and therapeutic methods useful for diagnosing and treating disorders related to this novel human protein.