This episode is a bit of a bioethics-fest! In addition to the xenotransplantation storyline started in the previous episode, there is also a discussion of the clinical use of stem cells, and some ethics of whether or not to honour a “do not resuscitate” order thrown in for good measure. Several sections could prove useful for introducing xenotransplantation (6:30 to 7:40; 10:06 to 11:00; 29:14 to 30:28). I think that the clip from 10 minutes into the episode is the most valuable discussion start; in a conversation between Abra and Mickie several of the main safety concerns are clearly expressed. For more on the science and ethics of this procedure, see a Bioethics Briefing on Xenotransplantation that I wrote a couple of years ago.
Regarding stem cells, the best clip is from 22:13 to 23:30. In this section, Gina (who is suffering from Motor Neuron Disease) discusses with her doctor whether or not she should fly to Singapore for injections of stem cells. This is the sort of procedure that was also being discussed in Susan Watt’s excellent Newsnight investigation into experimental stem cell therapies (a streamed video can be reached from this link).