Figure 2.

Comparison of published collagen and dentin proline and hydroxyproline δ ¹³C values from archaeological materials shows that are only minor offsets between these amino acids (y = 0.62 + 1.03x, adjusted R² = 0.9252, F(1,184) = 2290, P <0.001). The data were obtained from five studies that used LC/IRMS.34, 35, 36, 37, 38 The solid lines depict the linear correlations, and the shaded areas depict 95% confidence intervals [Color figure can be viewed at wileyonlinelibrary.com]