This invention is directed to the crystal structure of Acyl Carrier Protein Synthase complexed with Acyl Carrier Protein, the solution structure of B. The image forming apparatus issues, to a transmission server, a request for transmitting a replacement version of the identified type of firmware. The pre-decoder buffer is variable in size and has a variable initial buffering time for receiving the transmitted packets from the source server prior to decoding in the decoder. When the door lock is placed in a locking position by pressing an inside press button of the door lock, the spindle shaft connected with the press button moves the clutch member to the second position, thereby permitting the outside spindle tube to turn independently of the insert tube.