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siRNA overhangs - do they matter? (Aug/11/2005 )

if i'm choosing from 19bp target sequences selected for me by a siRNA target algorithm, should i put dTdT on the end, even if its not homologous? or should i use two homologous nucleotides?



3' end overhangs of siRNAs do not necessarily need to be homologous to target sequence, but it won't hurt if they do.