I'd hit the library and PubMed, Daisey, we're not here to do your
assignments for you.
If you have a question or want to discuss some aspect of development,
that IS what we're here for!
http://www.ncbi.nlm.nih.gov/entrez/
will get you started. I'm sure you can figure out what to search for.
There's even a "Reviews" tab in the results.
