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Depending on the species, the blastopore has been reported to become the mouth (protostomy), the anus (deuterostomy), both mouth and anus (amphistomy), or neither (i.e., the blastopore closes).
Adrenal glands. Researchers don't know exactly what causes the development of a pheochromocytoma. They do understand that the tumor develops in specialized cells, called chromaffin cells, located in the center of an adrenal gland.These cells produce and release certain hormones, primarily adrenaline (epinephrine) and noradrenaline (norepinephrine).hey do understand that the tumor develops in specialized cells, called chromaffin cells, located in the center of an adrenal gland. These cells produce and release certain hormones, primarily adrenaline (epinephrine) and noradrenaline (norepinephrine).