Craniopagus twins conjoined twins develop inutero remains unclear. Embryologists have traditionally attributed identical twinning as "splitting or fission" of either the inner cell mass of pleuripotential cells or early embryonic disc at 13–14 days of gestation just before the primitive streak. Some theorists suggested that conjoined twins develop as a result of the failed fusion of a single fertilized ovum. However a new hypothesis suggests that cranial fusion occurs between two separate embryos before the end of the 4th week of gestation. This can happen because the cranial neuropore is still open, which is responsible for the ultimate fusion and formation of
Stieber Twins Stieber Twins The Stieber Twins are a duo from Heidelberg, Germany, consisting of the brothers Martin (Marshall Mar, a.k.a. Martin Jekyll) and Christian (Luxus Chris a.k.a. Christian Hyde). They are known as graffiti artists, breakdancers, rappers, hip hop producers and DJs. The twins have been active since about 1983, and the two have been producing hip hop music since 1992. Their first instrumental was on the album "Alte Schule" ("Old school"), the first songs which featured the twins rapping were "HipHop und Rap" ("HipHop and Rap") and "Allein zu zweit" ("Alone Together") and were released in 1995 on the album