The present invention provides a novel polypeptide having a 1,3-N-acetylglucosaminyltransferase
activity; a method for producing the polypeptide; a DNA which encodes the polypeptide;
a recombinant vector into which the DNA is inserted; a transformant comprising
the recombinant vector; a method for producing a sugar chain or complex carbohydrate,
using the polypeptide; a method for producing a sugar chain or complex carbohydrate,
using the transformant; an antibody which recognizes the polypeptide; a method
for screening a substance which changes the expression of the gene which encodes
the polypeptide; and a method for screening a substance which changes the activity
of the polypeptide.