A murine embryo <a rel="nofollow" class="external text" href="http://www.criver.com/en-US/ProdServ/ByType/ResModOver/ResMod/Pages/CD-1Mouse.aspx">(CD-1)</a>, approximately 12.5 days old.
Matthias Zepper
2007-08-29
<span class="int-own-work">Self-photographed</span>