We have recently noticed that on Jack's right hand, there is a single crease that runs across his palm, rather than two. His left hand has two creases, which is common. It doesn't particularly mean anything on its own, and it tends to run in families. Approximately 10% of the population have it. It's more common in males and also in Asians. Michael, myself and Amy all have the two creases on each hand, as does Norma and Brian.
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