Could you tell me the dialing code for ? http://buylevitra.in.net/proagra/ procialis Researchers found a way to copy the natural way the body turns off one of the two X chromosomes that all female mammals have. They found that both chromosomes have a gene they called "XIST" that when turned on, makes an RNA molecule that envelops a chromosome. This stops this chromosome from having its genes expressed. When the XIST is turned on in women, it quiets their other X chromosome.