Before revision: components of bacterial cell walls, neurotransmitters and toxins), natural or man-made pharmacological compounds, present in meteorites or used in prebiotic experiments (such as the Miller–Urey experiment), might be important neurotransmitters, such as γ-Aminobutyric acid, and can play a crucial role in cellular bioenergetics, such as creatine.
After revision: components of bacterial cell walls, neurotransmitters and toxins), natural or man-made pharmacological compounds, present in meteorites or used in prebiotic experiments (such as the Miller–Urey experiment), might be important neurotransmitters, such as γ-aminobutyric acid, and can play a crucial role in cellular bioenergetics, such as creatine.