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Hi Xiang. If you are doing in vitro experiments like binding studies then try BODIPY Fluorophores. It conjugates the protein. Advantage is molecular weight of these BODIPY Fluorophores is few hundreds Da. Also, these dyes have well separable absorption and emission spectrums. Good luck Raj On Mon, Sep 16, 2013 at 9:24 PM, 李翔 <[log in to unmask]> wrote: > Hi everyone, > > I want to get some fluorescence labeled protein for my experiment. I wish > it is under 40K Da and have isoelectric point of 7 or slightly lower. Do > you have any suggestions on the commercially available protein please? > > Thanks very much for your help! > > Sincerely, > Xiang > > -- > Li Xiang > Department of chemistry, > Purdue University > Email：[log in to unmask] >