The transgene was generated via lentitransgenesis; a self-inactivating lentiviral vector was designed with 105 N-terminal residues of the Cyclin B1 (Ccnb1) gene (harboring the APC/C ubiquitination site responsible for its specific degradation in G0/G1 cells) and an enhanced green fluorescence protein (EGFP) sequence under control of a constitutive mouse phosphoglycerate kinase 1 (Pgk1) promoter. Line 1 was generated. (J:188998)