Acute myeloid leukemia is characterized by genetic abnormalities in hematopoietic progenitors. Dorsal root ganglion neurons differentiate from neural crest progenitors. This protein accumulates throughout the differentiation, ensuring the survival of erythroid progenitors. Common lymphoid progenitors (CLP) express low surface levels of KIT. Therefore, which progenitors colonize the thymus is unknown. Viruses that infect neutrophil progenitors can also be the cause of neutropenia. This suggests that Greyhounds are either progenitors to or descendants of herding types. David's ancestors are also understood as progenitors of the Messiah in several prophecies. X-ray radiation should be emitted by the accretion discs of Type Ia supernova progenitors. Some scholars deem the ancient Heniochi tribe the progenitors of the Abkhaz. Eta Carinae and WR 104 have been cited as possible future gamma-ray burst progenitors. They are the progenitors of humans, originally created by the Titans. Kali is the grandfather of Svarocisa Manu, one of the progenitors of mankind. Pentangle is thus often described as one of the progenitors of British folk rock. Whether these are to be regarded as possible progenitors of opera is highly debatable.