Figure 3 | Scientific Reports

Figure 3

From: Ancient amino acids from fossil feathers in amber

Figure 3

Mean D/L values of Asx, Glx, and Val during thermal maturation experiments of modern samples, including Gallus g. domesticus feathers in resin (this paper), ostrich eggshell28, limpet shell30, and coral29. (A) 110 °C. (B) 140 °C. Note that the other experiments (ostrich eggshell, limpet shell, and coral) included environmental water, whereas the experiments reported in this paper (feathers in resin) did not include any environmental water.

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