Two different FlexiTube products are available: FlexiTube siRNA and FlexiTube GeneSolution. FlexiTube siRNA is a cost-effective solution for RNAi analysis of small numbers of genes. siRNAs are provided in 5 nmol or 20 nmol amounts for human, mouse, or rat genes, or in economical 1 nmol amounts for human and mouse genes. FlexiTube GeneSolution is a gene-specific package of 4 preselected siRNAs (1 nmol) for a target gene. FlexiTube GeneSolutions enable researchers to use multiple siRNAs for each target ensuring reliable results. FlexiTube siRNA and FlexiTube GeneSolutions are designed using innovative HP OnGuard siRNA Design and are available at QIAGEN's GeneGlobe Web portal.