![XL1-Blue MR & MRF Competent Cells XL1-Blue MR & MRF Competent Cells](/cs/publishingimages/Competent Cells MC-320x320.jpg)
XL1-Blue MR & MRF Competent Cells
When the F episome and blue-white screening are unnecessary, use XL1-Blue MR supercompetent cells. When cloning tetracycline-resistant plasmids, use XL1-Blue MRF Kan supercompetent cells to select for the F episome and provide a more intense blue color for blue-white screening.