The N-acetyl-D-galactosamine transferase protein of the present invention is characterized by transferring N-acetyl-D-galactosamine to N-acetyl-D-glucosamine with \u03b21,3 linkage, and it preferably has the amino acid sequence shown in SEQ ID NO: 2 or 4. The system has a database for receiving and storing bid information, including rebates and discounts, from at least one bidder and software for transforming bid information into values having a standard unit of measure. The first end is provided with first internal threads corresponding to first external threads on the one end of the fixed pipe. The bifunctional nature of ACC allows for the efficient production of single substrates and substrate libraries using solid-phase synthesis techniques. The system comprises variety of means for transferring picture image data recorded by a variety of digital cameras to an image server installed in a DPE or the like and a variety of accessing means for enabling the picture image data stored in the image server to be accessed. The sound absorbing structure includes a porous air-permeable bag and flaky wood chips provided in the bag.