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Perhaps, instead of depending on developmental origin, the key factors in how easily cell types can interconvert relate to similarities and differences in gene regulation between the mature cell types19.

The enantiomeric form of these allenes is fixed when they are in their ground states, but they spontaneously interconvert between the two enantiomers when excited to a state known as a triplet3.

Second, reaction conditions had to be identified that allowed a base to drive catalytic cycles — which is difficult in this context, because bases often interconvert mirror-image isomers.

Nickel and aluminum catalysts interconvert olefins and nitriles without the direct use of cyanide as a reagent.

Nickel and aluminum catalysts interconvert olefins and nitriles without the direct use of cyanide as a reagent.