| This section refers to "identical brothers" rather than |
| "identical twins" to account for the possibility of identical |
| triplets, etc. In some cases, non-identical brothers (and even |
| other related men) will not be excluded after initial genetic |
| testing. This section should not be used to resolve those cases |
| because more sophisticated genetic testing can differentiate |
| between non-identical siblings. If a case occurs in which, after |
| initial testing, two men are not excluded, both men should be |
| ordered to submit to additional testing as provided in § 505(c) |
| to determine which is the father. In the extremely rare case in |
| which a competent laboratory exhausts all of its in-house testing |
| and still cannot determine which non-identical sibling is |
| excluded, the common practice is to provide the genetic material |
| to another laboratory for more extensive testing to resolve the |
| case. |