 describe the expression of functional recombinant xcex0GalA in transgenic cells and the corresponding dramatic reduction of cell surface Galxcex0(0,0)Gal carbohydrate such expression causes (Sections 0 and 00), further demonstrate that transgenic cells expressing functional recombinant xcex0GalA elicit a significantly reduced level of complement-mediated cytoxicity (Section 0), and still further demonstrate that transgenic xcex0-galA dramatically reduces the level of Galxcex0(0,0)Gal in vivo. The 