1. Supplementary Figure 1 – Toh et. al. 0 hr 12 hr24 hr 24 hr + PurvATaxol: 24 hr + MG132 24 hr + Roscovitine 24 hr + R0-3066 MPM2levels Thymidine block Thymidine Wash-out; +/-Taxol; +/-R0-3066 +/-MG132; +/- Roscovitine; +/- Purv-A Time (hrs): -24 0 12-15 24-27 Cell Cycle Phase: Asyn. G1/S Mitosis Collection B UTPurATaxolPurA + Taxol % PI stained cells 0 5 10 15 20 7.1 7.0 17.1 10.6 A

2. 2N 4N Taxol + Purv A Taxol + MG132 Taxol + R0- 3066 PurvAMG132R0-3066 UT (0 hrs) UT (24hrs) Roscovitine Taxol + Roscovitine Thymidine block Thymidine Wash-out; +/-Taxol; +/-R0-3066 +/-MG132; +/- Roscovitine; +/- Purv-A Time (hrs): -24 0 12-15 24-27 Cell Cycle Phase: Asyn. G1/S Mitosis Collection Taxol (24hrs) Supplementary Figure 2 – Toh et. al. 2N 4N

3. Released in CDDP from Thymidine-block Thymidine-blocked + CDDP Released in DMEM from Thymidine-block M1 Supplementary Figure 3 – Toh et. al. 1.9%1.6% 16.7%15.8% 14.8% 15.4% 2N 4N

4. H1299 A549 U2OS Controlsi73.1si73.2si73.3si73.4 Controlsi73.1si73.2si73.3si73.4 p73 gapdh Controlsi73.1si73.2si73.3si73.4 siRNA: A549U2OS 0 5 10 15 20 25 30 Controlp73.1p73.2p73.3p73.4 0 5 10 15 20 25 Controlp73.1p73.2p73.3p73.4 UT Taxol 0 5 10 15 20 25 ControlsiRNA:p73.1p73.2p73.3p73.4 % cleaved caspase-3 H1299 B A Supplementary Figure 4 – Toh et. al.

5. 0 6 10 24 48 60 : Time (hrs) WT p53 -/- p73 -/- 2N 4N 2N 4N 8N 2N 4N Supplementary Figure 5 – Toh et. al.

6. Control siRNA 1 Control siRNA 2 PLK1 siRNA 1 PLK1 siRNA 2 Supplementary Figure 6 – Toh et. al. 2N 4N

7. Asynchronous Thymidine-blocked and released UTMG132UT MG132 3.7%3.1%14.8%16.4% 4.1% 4.7% 39.6% 40.5% Supplementary Figure 7 – Toh et. al. PI UT MG132

8. pcDNA p73  DNp73  1.3 7.2 2.8 19.3 11.3 15.6 0 5 10 15 20 25 % cleaved caspase-3 UT Taxol 4.8 17.0 4.9 27.0 17.0 38.0 0 10 20 30 40 45 pcDNA p73  p73DD % cleaved Caspase-3 UT Taxol B A Supplementary Figure 8 – Toh et. al.