You hope to study a gene that codes for a neurotransmitter protein produced in human brain cells. you know the amino acid sequence of the protein. explain how you might (a) identify what genes are expressed in a specific type of brain cell, (b) identify (and isolate) the neurotransmitter gene, (c) produce multiple copies of the gene for study, and (d) produce large quantities of the neurotransmitter for evaluation as a potential medication.