Matthews applies a similar principle to her "tummy-tuck" treatments at the spa, the only difference being that the longer needles used in those procedures actually cause muscle contraction, tightening the appearance of the stomach.

FORBES: Facing the Point

This is fascinating to people interested in the question of how genomes switch from state to state say, from the state of a stem cell, which can grow into almost anything, to that of a muscle cell, committed to an existence of contraction and expansion.

ECONOMIST: Human genomics