Lentiviral vectors mCherry-hCdt1(30/120)/pCSII-EF-MCS (DDBJ/EMBL/GenBank, AB512478) and mVenus-hGeminin(1/100)/pCSII-EF-MCS (DDBJ/EMBL/GenBank, AB512479) were purchased from the Riken Brain Science Institute, Japan (Dr. Atsushi Miyawaki, head of provider laboratory, and Dr. Hiroyuki Miyoshi, developer of pCSII-EF-MCS). Lentiviral particles were generated by co-transfection of HEK-293TN cells (System Biosciences) with mCherry-hCdt1 (30/120)/pCSII-EF-MCS or mVenus-hGeminin (1/100)/pCSII-EF-MCS lentiviral vectors, alongside the packaging plasmid psPAX2 (Addgene plasmid, #12260) and the envelope plasmid pMD2.G (Addgene plasmid, #12259). The culture supernatant was collected and concentrated by ultracentrifugation at 22,000 rpm for 3 h (Beckman L7-55 with SW32Ti rotor) at 4 °C. The virus titer was estimated by transduction on HeLa cells and subsequent flow cytometric analysis for fluorescent protein expression.
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