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For comparison, −70 kJ/mol corresponds to 20% of the energy of a carbon–carbon single bond or 30 k T at 298 K. One basis for the “lipid world” or “cells-first” hypothesis ( 13 25 ), in which abiotic formation of membranes contributed to the emergence of life, is that lipids in water spontaneously self-assemble into supramolecular structures, such as membranes and micelles, above a critical concentration.

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