On Tue, 30 Jan 1996 mobio at electriciti.com wrote: > Does anyone working with RNA have problems with RNase contamination from pipet > tips? > Sorry, NO i do not have any problems.I use tips only once and I do autoclave them before using. Autoclaving doesnt get rid of RNAse, DEPC treatment does but we never DEPC treat tips.> Good luck Lubi Lubi at halia.pbrc.hawaii.edu