1 Fragile X syndrome (also called Fragile X) is the most common inherited form of mental problems (mental retardation). 2  Fragile X syndrome is caused by changes in a single X chromosome (FMR1).  FMR1 does not produce enough protein (FMRP) that works cell communication.
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The Galileo mission discovered something amazing! Europa has its own atmosphere, although it is very, very thin. This atmosphere is created when fast moving molecules in Jupiter's magnetosphere hit the surface of Europa and knock out a water molecule. These molecules may float around Europa for awhile, but because of Europa's weak gravity, the atmosphere rapidly drifts away. Because Europa has an atmosphere with molecules that can escape, there is a donut-shaped belt of material inside Jupiter's magnetosphere that is called the Europa torus. Jupiter's moon Io also has a torus.