Early Development of the Frog’s Egg
https://bmccellbiol.biomedcentral.com/articles/10.1186/1471-2121-12-56
Eggs, cleavage stages, and gastrula stage embryos
https://www.ncbi.nlm.nih.gov/pubmed/564938
Embryonic Development
http://universe-review.ca/R10-33-anatomy09.htm
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