Hello there is an apparatus of Biorad : the Prepcell; It s a big SDS-page and you can elute the protein. Bio-rad normally lend easily prepCell. Anne Jungbluth Laboratoire d'orthopedie de l'UCL Avenue Mounier, 53 Tour Pasteur, 5388 1200 Bruxelles jungbluth at orto.ucl.ac.be