However, ethnic violence occurs in sporadic outbursts. High attack rates are documented in sporadic outbreaks. There are also autosomal recessive disorders that resemble sporadic cases of HD. Incidents and sporadic warfare continued, however. Some sources divide PCT into two types&colon; sporadic and familial. This resulted in sporadic and intense touring and recording schedules. It occurs in both sporadic and hereditary forms. The origin of most sporadic cases is undetermined. Ten of the aircraft were operational losses, caused by flameouts and sporadic structural failures. In particular, decreased BRCA1 expression contributes to both sporadic and inherited breast tumor progression. Epigenetic repression of DNA repair genes is often found in progression to sporadic glioblastoma. Human prion diseases come in sporadic, genetic and infectious forms. Thus shipments became sporadic and delayed. Therefore, persecution was inconsistent, local, and sporadic. He noted that inherited retinoblastoma occurs at a younger age than the sporadic disease.