Edinburgh Mouse Atlas Project
- Computer modeling of stages of mouse embryogenesis to map the expression of different genes. 3D Embryo Anatomy Atlas and gene expression database at MRC Human Genetics Unit, Edinburgh.
- http://genex.hgu.mrc.ac.uk/

Comparative Placentation
- Provides an examination and evaluation of placenta from many different types of mammals. Includes glossary, taxonomy and biography of author, maintained by the University of California, San Diego.
- http://medicine.ucsd.edu/cpa/