Abstract: The invention as described herein relates to the efficient production of recombinant, clinically effective lysosomal enzymes using a transformed insect cell expression system. For example, to create the expression system of the invention, any insect cell can be transfected with a plasmid comprised of a gene encoding the human glucocerebrosidase gene and genetic elements that enhance its expression. The insect cell transfected with the plasmid encoding glucocerebrosidase secretes synthesized glucocere-brosidase into its growth media. The recombinantly produced clinically effective glucocerebrosidase produced by the insect cell expression system can be used to treat Gaucher's disease.