VPI's line of super stripe borneos will from time to time lack sub ocs. Who knows what pops up once you actually get beyond 3,4 or even 5 generations of in/line breeding though.... not many have. All the ones that have though seem to end up with animals without them and will have siblings with them. Inbreeding may preserve certain traits but can cause a drastic loss of other things.

http://vpi.com/galleries/images/144
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DNA_CURTUS "It's in our Genes"