| 1 | At this stage the fungususes a poison to kill its host. | |
| 2 | This finding indicated that the cancers sometimes acquired mitochondria from their hosts. | |
| 3 | When they reach a certain quorum, there are too many of them for the host to do anything about it. | |
| 4 | According to this hypothesis, some parasites alter the behavior of their hosts in ways that benefit the parasite. | |
| 5 | Skalka speculates that the sequences her team and others have found might protect the host from infection. |