Is there a guarantee for the performance of FlexiTube siRNAs in gene knockdown?

Yes. FlexiTube siRNA comes with a one-time–only replacement offer. If 2 or more FlexiTube siRNAs for the same target gene are ordered and two or more do not result in gene silencing, QIAGEN will provide 2 additional siRNAs free of charge, once only. You will be asked to provide supporting data, demonstrating that the siRNA failed to knock down the target gene by at least 70% at the mRNA level under appropriate transfection conditions. Supporting data should include transfection efficiency data, quantitative silencing data, and data showing ≥ 70% knockdown of a positive control. This offer is valid for up to 6 months after the date of delivery.