The Major Obstacle to the Use of Xenotransplants Is Overcome

Multiple Choice

The major obstacle to the use of xenotransplants is overcome by ________________.

A) series of injections that depress the immune systems of recipients
B) changing genetic markers in humans to make them more receptive
C) changing genetic markers in donor animals to make them more compatible with human recipients
D) introducing a complement of immune system genes to both the donor animal and recipient human
E) doing more than one of these