内容摘要：Ten prisoners, several of them facing murder charges, have escaped a New Orleans jail, authorities say.

Ten prisoners, several of them facing murder charges, have escaped a New Orleans jail, authorities say.

The breakthrough has brought delight to the scientists but also the thousands of cat lovers that originally crowdfunded the research.The scientists hope solving the puzzle could also help shed light on whether orange coloured cats are at increased risk of certain health conditions.

It has been known for decades that it is genetics that gives orange tabby cats their distinctive colouring, but exactly where in the genetic code has evaded scientists till now.Two teams of scientists at Kyushu University in Japan and Stanford University in the US have now revealed the mystery in simultaneous papersWhat the teams found was that in the cells responsible for giving a cat its skin, hair follicles and eyes their colour - melanocytes - one gene, ARHGAP36, was much more active.

Genes are made up of pieces of DNA which give instructions to a cat's cells, like other living creatures, on how to function.By comparing the DNA from dozens of cats with and without orange fur they found that those with ginger colouring had a section of DNA code missing within this ARHGAP36 gene.

Without this DNA the activity of the ARHGAP36 is not suppressed i.e. it is more active. The scientists believe that the gene instructs those melanocytes to produce lighter pigment.

For decades scientists have observed that cats with completely ginger colouring are far more likely to be male. This tallies with the fact that the gene is carried on the X chromosome.Overall, he says, the number of people playing premium titles isn't increasing, but the cost of making them is.

"The people who make games - they still need to make revenues each year because, you know, capitalism," he says.One way of doing this is by attracting new players.

Doom's director Hugo Martin says the response to Doom: The Dark Age's previews were encouraging - something he puts down in part to its new "Medieval sci-fi" setting and altered gameplay style."We see it in the comments - a lot of people are saying 'I think this is going to be my first Doom', and that's exciting for us," he says.