A specific example of a drug that affects a neurotransmitter in this way is cocaine, which potentiates the effects of the neurotransmitter by interfering with its reuptake from synaptic clefts. Researchers have found that this neurotransmitter is largely responsible for mood.

Which of the following is an advantage of using embryonic stem cells in medical research? a. the use of embryonic stem cells is much less expensive than the use of adult stem cells. o b. no living tissue is damaged when scientists use embryonic stem cells. o c. embryonic stem cells are able to differentiate into a wider range of cells than adult stem cells. d. there is no controversy surrounding the use of embryonic stem cells.