A U.S. Patent Application for a “Process for Manipulating the Level of Glycan Content of a Glycoprotein” was published by Amgen on March 21st, 2019. The present invention is a recombinant protein produced by a method for manipulating the fucosylated glycan content on a recombinant protein comprising inoculating a bioreactor with mammalian host cells expressing the recombinant protein, culturing the mammalian host cells in a serum-free, chemically defined cell culture medium; wherein the cell culture medium includes from 10 to 100 ppb copper and from 50 to 1000 nM manganese. Learn More