Histology sections

 
 
a histology section of a human embryo   a histology section of a mouse embryo   a histology section of a human embryo
   
High Resolution eHistology Viewer - Human   Kaufman Atlas of Mouse Development   Annotated heart H&E sections
         
         
 
a histology section of a human embryo
     
Pentachrome staining   Alcian blue/PAS