a CADs for O + S system, SALL4 system and OCT4 system. PO, permanently open. CO, close to open. OC, open to close. Take O + S system as reference is shown. OCT4, OCT4 system. SALL4, SALL4 system. O + S, OCT4 + SALL4 system. b Motif analysis of the SALL4, OCT4, or O + S-specific enrichment peaks at D0, D4, D7, and D10 during iPSCs induction, the peaks for each day in DsRed system as a background was removed from the peaks at D0, D4, D7 and D10 in SALL4, OCT4, and O + S system. Statistical analysis was performed using Karlin/Altschul statistics, and the -Log10(p-value) for motif is shown. OCT4, OCT4 system. SALL4, SALL4 system. O + S, OCT4 + SALL4 system. c Representative Genomic loci and genes for OCT4 + SALL4 / SALL4-Common-open peaks and OCT4 + SALL4 / OCT4-Common-close peaks. O4, OCT4 system. S4, SALL4 system. O + S, OCT4 + SALL4 system. O + S/S4-C-O, OCT4 + SALL4 / SALL4-Common-open; O + S/O4-C-C, OCT4 + SALL4 / OCT4-Common-close. d RNA-seq data shows the expression of representative genes in Fig. 5c. Data are mean ± SD. n = 2 samples for each time point from 2 independent experiments. e The iPSCs induction efficiency using Sall4, Oct4, or Oct4 + Sall4 overepressing with representative S4/O + S-common open genes (Rsk1, Esrrb and Tfap2c), O4/O + S-common open genes (Sox2) and O + S/OCT4-Common-close genes (Sbsn and Mogat2). DsRed, Sall4, Oct4, and Oct4 + Sall4 as a control are shown. Data are mean ± SD. Statistical analysis was performed using a two-tailed, unpaired t test; n = 6 well from 3 independent experiments. Oct4 + DsRed versus Oct4 + Mogat2, n.s. p = 0.1248925; Oct4 + DsRed versus Oct4 + Sbsn, n.s. p = 0.3742057; Oct4 + DsRed versus Oct4 + Rsk1, **p = 0.0034229; Oct4 + DsRed versus Oct4 + Tfap2c, ****p = 0.0000169; Oct4 + DsRed versus Oct4 + Esrrb, ****p = 0.0000001; Oct4 + DsRed versus Oct4 + Sox2, ****p = 0.0000007; Sall4 + DsRed versus Sall4 + Mogat2, **p = 0.0077033; Sall4 + DsRed versus Sall4+Sbsn, *p = 0.0382438; Sall4 + DsRed versus Sall4 + Rsk1, **p = 0.0019697; Sall4 + DsRed versus Sall4 + Tfap2c, **p = 0.0015495; Sall4 + DsRed versus Sall4 + Esrrb, ***p = 0.0001515; Sall4 + DsRed versus Sall4 + Sox2, **p = 0.0012618; Sall4 + Oct4 + DsRed versus Sall4 + Oct4 + Mogat2, ****p = 0.0000019; Sall4 + Oct4 + DsRed versus Sall4 + Oct4 + Sbsn, ****p = 0.0000092; Sall4 + Oct4 + DsRed versus Sall4 + Oct4 + Rsk1, **p = 0.0012754; Sall4 + Oct4 + DsRed versus Sall4 + Oct4 + Tfap2c, ****p = 0.0000006; Sall4 + Oct4 + DsRed versus Sall4 + Oct4 + Esrrb, ****p = 0.0000008; Sall4 + Oct4 + DsRed versus Sall4 + Oct4 + Sox2, ****p = 0.00000001.