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. 1998 Jun 23;95(13):7260–7263. doi: 10.1073/pnas.95.13.7260

Figure 1.

Figure 1

The absorbance spectra of aqueous prebiotic organic polymers produced by the action of a spark discharge on a mixture of methane, water, and ammonia for 6 days and a 0.1 M KCN (brought to pH 8 with HCl) polymerization, each dissolved as 330 mg of carbon per liter solutions.