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Fig. 4 | Evolution: Education and Outreach

Fig. 4

From: Prebiotic Chemistry: What We Know, What We Don't

Fig. 4

Evidence for the Strecker amino acid synthesis and in the Miller–Urey experiment. a The cyanohydrin (top) and Strecker (bottom) mechanisms for the formation of hydroxy and amino acids from ammonia (NH3), hydrogen cyanide, and aldehydes or ketones. b Variations in the concentrations of ammonia, aldehydes, and hydrogen cyanide over the course of a Miller–Urey experiment. Fig. 4b reproduced from Miller (1957)

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Evolution: Education and Outreach

ISSN: 1936-6434

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