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Additional meteoritic 3C and 4C sugar acid analyses. (A) Glyceric acid and 4C acids from the Murray meteorite. Murray has a much longer residence time on Earth than Murchison, possibly resulting in more contamination of l-threonic acid. HMG was not identified in Murray; this may be due to a general lower abundance of compounds in this sample. (B) HMG and 4C acids from a sample of Murchison 52. (separate from that in Fig. 4C)
