A cDNA encoding the modified estrogen receptor-ligand binding domain sequence ERT) linked to the cre gene replaced the lacZ gene in a plasmid containing the Col11a2 promoter/enhancer sequences. This construct was injected into fertilized ova to establish a transgenic line. Founder information and line numbers were not available. The pound symbol (#) is used when no line is specified and/or lines are pooled. (J:235689)