T H I S paper reports the successful induction by X rays of two tandem direct duplications for the lozenge region of the X chromosome of Drosophila. Numerous tandem direct duplications (ABAB) of spontaneous origin are now known in Drosophila: Bar, STURTEVANT (1925), MULLER, PROKOFYEVA-BELGOVSKAYA and KOSSIKOV (1936) and BRIDGES (1936); Hairy wing, DEMEREC and HOOVER ( 1939) ; Dp (2: 2) Star, LE...

MOTIVATION Genome analysis suggests that tandem duplication is an important mode of evolutionary novelty by permitting one copy of each gene to drift and potentially to acquire a new function. With more and more genomic sequences available, reconstructing duplication history has received extensive attention recently. RESULTS An efficient method is presented for inferring the duplication histo...

The origin and subsequent accumulation of spliceosomal introns are prominent events in the evolution of eukaryotic gene structure. However, the mechanisms underlying intron gain remain unclear because there are few proven cases of recently gained introns. In an RNA-dependent RNA polymerase (RdRp) gene, we found that a tandem duplication occurred after the divergence of potato and its wild relat...

A 5-year-old girl presented with headache and vomiting. Head computed tomography magnetic resonance imaging showed a right frontal lobe tumor marked calcification. The patient underwent resection surgery suspicion of anaplastic ependymoma, the was gross totally removed. Pathological examination revealed areas dense cells high nucleocytoplasmic ratio myxoid consisting round-shaped nucleus eosino...