From a soup or a seed? Pyritic metabolic complexes in the origin of life.

In the classical 'prebiotic soup' model of the origin of life, biomolecules are seen arising abiotically on the Earth and then interacting randomly in solution to form proto-cells. This model has encountered increasing difficulties, however, and recently several alternatives have been proposed. In some of these models, it is postulated that proto-cells evolved from simple biomolecular complexes originally attached to mineral surfaces, especially those of pyrite. The subsequent evolution of these complexes has been likened to embryonic development.