When choosing a clone, we recommend blasting the sequence tag to estimate the location of a gene trap. Generally you will want to select a clone that traps the furthest upstream. The vast majority of gene trap cell lines have been correctly identified, as judged by DNA sequencing (i.e., repeat determination of the DNA sequence tag when the ES cell clone is requested). However, incorrectly identified ES cell clones are occasionally encountered, either because of human error or because a thawed ES cell line gets overgrown by a contaminating ES cell line. Therefore, we strongly recommend that you request verification of the identity of your ES cell line by DNA sequencing (there is an additional fee for DNA sequence verification of your clone). We also recommend that recipients of ES cells re-verify the identity of the ES cell line by RT-PCR and/or Southern blot analysis. If more than one ES cell line is available for your "gene-of-interest", we recommend that you order several of the ES cell lines. Ordering more than one ES cell line for a specific 'gene-of-interest' will increase the chances of success.

ES Cell Sex and Genotype: These ES Cells are expected to be male (XY) and heterozygous/hemizygous for the mutation.

Requested cell lines are tested by PCR analysis for mycoplasma spp. and Murine Parvoviruses (MPV) upon completion of expansion and prior to shipment. The parental cell line K7.1, from which these cells were derived, was tested for multiple mouse pathogens; please see the Health Status Report.

Mice derived from requested cell lines via Microinjection services will be pathogen tested prior to delivery of mice and health reports will be provided. If you require additional health status information prior to requesting microinjection please email mmrrc@ucdavis.edu.