Unfortunately, there is currently not a product offering that is a DH5α-T1R competent cell line.
Kindly reference the documentation for your cells. The response curve is cell dependent not plasmid dependent. The plasmid only selects for which antibiotic the transfected cells will survive.
For the shRNA glycerol stocks, we supply them at TB with carbenicillin at 100 ug/ml. Kindly review our Technical Bulletin at this link:
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/259/692/shclngbul.pdf



