[snip Q about how to detect glycoproteins] . Two solutions: Either probe with biotinylated lectins and Streptavidin-HRP or Oxidize with 10 mM sodium-meta-periodate, then incuabte with biotin-hydrazide, then Streptavidin HRP. If you want high sensitivity I would recommend using a chemiluminescent substrate (SuperSignal from Pierce would do nicely). Keld.