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Hello everyone, I am experiencing problems with the prediction of amino acid types; it seems to work only randomly. I attached a screen shot of the assignment window and the peaks of the respective spin system. Although alphas and betas are assigned correctly I do not get any kind of prediction (see bottom right in assignment panel; fig. assign_main.tiff). This holds for quite a lot but not for all spin systems; unfortunately, I can't make out an underlying pattern. In the example, the spin system should be easily identified as a threonine (fig. spin244_res.tiff). Choosing "Predict Type" from the "Resonance->Spin System" panel does not work either. Could this be a software issue? I am running ccpn analysis version 2.1.3 (downloaded 05/14/10) on OSX 10.6.3 (of course intel version). Thanks. Regards, Marcel -- Marcel Jurk Leibniz Institut fuer Molekulare Pharmakologie (FMP) Solution NMR (AG Schmieder) Robert-Roessle-Str. 10 13125 Berlin Germany eMail: [log in to unmask] Phone: +49-30-94793223 Fax: +49-030-94793169