8 Nucleated (7 celled) Embryo sac - Help

[chemex]

Hello, first time poster but have been admiring the site and it's inhabitants for a while

I was hoping someone out there knew of a good, step-by-step guide on how the 7 celled embryo sac is formed. I am being told that a lot of detail will be required for my first exam, and am simply hoping to find a resource to add to the information my book has given me.

Thanks so much in advance,
Ron

[kingber]

Genetic and molecular identification of genes required for female gametophyte development and function in Arabidopsis. Development 132, 603-614
you can see this paper