31. Disproving that possibility, though, will be nearly impossible, so xenotransplants will always involve some apprehension and controversy. 32. On 23 January 1964, xenotransplant by transplanting the heart of a chimpanzee into a desperately ill and dying man. 33. Xenotransplants , as such cross-species operations are known, could be commonplace a decade from now, they say.34. In September 1996, the agencies released a draft guideline for xenotransplant research that included monitoring guidelines for animals and patients. 35. After three days of debate, scientists reached no consensus, but some called for a national panel to control xenotransplants . 36. America's Centers for Disease Control are about to pronounce on xenotransplants , but the guidelines are expected to be voluntary. 37. But those who go so far as prohibiting all but pigs as sources for xenotransplants have not spoken publicly or in interviews. 38. The specter that xenotransplants might contribute to the threat of new diseases pits the field of emerging diseases against that of xenotransplants. 39. The specter that xenotransplants might contribute to the threat of new diseases pits the field of emerging diseases against that of xenotransplants . 40. For such " xenotransplants " would be an open invitation for hitherto unknown animal diseases to transfer themselves to people.
