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Upon delivery of all twenty-four factors, ESC-like colonies emerged that reactivated the Fbx15 reporter and could propagate indefinitely.

To identify the genes necessary for reprogramming, the researchers removed one factor at a time from the pool of twenty-four.

The most well-known type of pluripotent stem cell is the embryonic stem cell.

However, since the generation of embryonic stem cells involves destruction (or at least manipulation) of the pre-implantation stage embryo, there has been much controversy surrounding their use.

It was produced by combining three images obtained using different kinds of detectors Scientists found red blood cell like structures on this ungual claw from an unknown species of theropod.

They believe comparing these cells with other species will allow them to learn about dinosaurs metabolic rate The said: 'Incredibly, none of the samples showed external indicators of exceptional preservation and this strongly suggests that the preservation of soft tissues and even proteins is a more common phenomenon than previously accepted.'Dr Sergio Bertazzo, another author who worked on the study at Imperial College London, said: 'We still need to do more research to confirm what it is that we are imaging in these dinosaur bone fragments, but the ancient tissue structures we have analysed have some similarities to red blood cells and collagen fibres.

Researchers using scanning electron microscopes discovered soft tissue resembling red blood cells and collagen fibres (shown above) on 75-million-year-old fossilised dinosaur bones.Induced pluripotent stem cells (also known as i PS cells or i PSCs) are a type of pluripotent stem cell that can be generated directly from adult cells.The i PSC technology was pioneered by Shinya Yamanaka’s lab in Kyoto, Japan, who showed in 2006 that the introduction of four specific genes encoding transcription factors could convert adult cells into pluripotent stem cells.However, considerable advances have been made in improving the efficiency and the time it takes to obtain i PSCs.Upon introduction of reprogramming factors, cells begin to form colonies that resemble pluripotent stem cells, which can be isolated based on their morphology, conditions that select for their growth, or through expression of surface markers or reporter genes.

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