Apparently Whatman no longer produce the ET-31 paper that I've been using for capturing poly-Glu-Tyr after phosphorylation... Does anybody know where to buy ET-31 paper or another filter paper that can substitute for ET3-1, Thanks, Bo Falck Hansen, phd Diabetes Biology Novo Nordisk, Building 6B1.56 DK-2880 Bagsværd Denmark Tel: +45 4442 2007 Fax +45 4442 2638