Somebody asked about cysteines: only one cysteine (therefore only dimers possible), but the native gels are exactly the same with lots of DTT anyway. JPK ******************************************* Jacob Pearson Keller Northwestern University Medical Scientist Training Program Dallos Laboratory F. Searle 1-240 2240 Campus Drive Evanston IL 60208 lab: 847.491.2438 cel: 773.608.9185 email: [log in to unmask] *******************************************