E16+17 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 E16 and E17. 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