Some siRNAs have been deleted from our standard GeneGlobe offering. For those siRNAs, the entries in public databases may have changed and the transcript is no longer listed in those databases. In other cases, we have added siRNAs with a new design.
You can still find previously listed siRNAs in GeneGlobe by searching for the specific SI number (ordering number). See also FAQ 1366 on this topic.