Which of the Following Is an Important Obstacle to the Routine

Multiple Choice

Which of the following is an important obstacle to the routine use of gene therapy?

A) It has proven difficult to produce recombinant viruses carrying normal copies of a particular human gene.
B) It has proven difficult to get human host cells to express foreign genes in adequate amounts.
C) It has proven difficult to identify the human genes involved in genetic disorders.
D) None of the above is currently an obstacle. Gene therapy is now routine.
E) All of the above are important obstacles.