Chiral molecules can have dramatically different functional properties while sharing identical chemical formulae and almost identical structures. The molecular structure of two types of a chiral molecule—so-called enantiomers—are mirror images of each other where one cannot be superposed on the other any more than your right hand can fit front-to-back on the left. While a lot of chiral molecules are traditionally considered fixed as left- or right-handed, chiral molecules based on helices are known to be able to switch in response to changes in their environment.
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