IMAGE (IMAGE) Nara Institute of Science and Technology Caption Heterozygous loss of the Zbtb38 (Zbtb38+/-) decreased epiblast cell proliferation and increased apoptosis shortly after implantation (E4.5~), leading to early embryonic lethality. Nanog and Sox2 expressions were reduced in the Zbtb38+/- embryos. ICM: inner cell mass. Credit Eishou Matsuda Usage Restrictions Credit required License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.