Deletion of the gene was not lethal and there was no overt phenotype either in hemizygous males -LRB-- / y) or in homozygous females -LRB-- / --RRB-. (biochemj.org)
Similar to hemizygous TTD mice carrying one true Xpd knockout allele (XpdTTD / KO), compound heterozygous XpdTTD / † XPCS mice were born at the expected Mendelian frequencies. (journals.plos.org)
XpdTTD / KO hemizygous cells were thus used as the baseline on which to compare the activity of compound heterozygous cells. (journals.plos.org)