E12+13 to E21 Survival The following images are from one coronally-sectioned brain and one sagittally-sectioned brain of an E21 rat embryo exposed to tritiated thymidine on E12 and E13. Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res Download: Large | High Res