Reacting to this, I felt the need to point out that this is what a blastocyst looks like:
Those round things are individual cells. The zona pellucida is the human equivalent of an egg shell. The inner cell mass is the important part.
Reacting to this, I felt the need to point out that this is what a blastocyst looks like:
Those round things are individual cells. The zona pellucida is the human equivalent of an egg shell. The inner cell mass is the important part.