| This insusceptibility or immunity may be either natural or acquired. |
| Some of these genes function in the nervous system, and others encode stable proteins, but it is safe to say that the cause of insusceptibility is not known in every case. |
| Perhaps the easiest way to parse the Form's insusceptibility to appearing unequal is to treat the claim as implying that the Form cannot appear other than itself, i.e., equal. |
