Flip Hoedemaeker, CvF RUL/TNO, Leiden, The Netherlands (sbtnfh at rulsfb.LeidenUniv.nl) wrote: : : I don't know where the "S-" stands for, but DABITC It's a soluble form of DABITC which allows proteins to be tagged with this useful chromophore while they are in a native state. But I still don't know where to get it from, Andy! Good luck Peter