n-propyl gallate is also recommendet for this purpose. We are using a 5% soln. in glycerol. It will take some time for dissolve. Ref.: Science 217 (1982), 1252-5 Wolfgang Schechinger Institute for Diabetes Research Kölner Platz 1 80804 Muenchen Germany Phone +49 (89) 30 79 31 24 Fax 30 81 73 3 E-mail: DIABETES at LRZ.UNI-MUENCHEN.DE