In diagram A, we basically describe the lining of the uterus we call the endometrium. So we have connective tissue and we have vascular tissue. We have these cells shown in light pink as well as the red cells that make up the epithelium of that endometrium. And we also have these blood vessels that carry the oxygen and the nutrients and so forth along this endometrium. Now, this is the actual blastocyst. So we have the dark purple cells is the trophy blast.