Extended Data Fig. 2: Zn-enrichment of the neonatal line in the enamel of lower second molar of NMMNH P-19541. | Nature

Extended Data Fig. 2: Zn-enrichment of the neonatal line in the enamel of lower second molar of NMMNH P-19541.

From: The origin of placental mammal life histories

Extended Data Fig. 2: Zn-enrichment of the neonatal line in the enamel of lower second molar of NMMNH P-19541.

(a, c) coronal sections of enamel of paraconid (a) and protoconid (c) under cross-polarized light. Insets show location on coronal sections of entire tooth. (b, d), LA-ICP-MS trace element maps, showing higher concentrations of Zn in discrete areas corresponding to the neonatal line (white arrows). Abbreviations: DEJ, dentinoenamel junction; NNL, neonatal line; OES, outer enamel surface. Scale bars: 1 mm (insets), 100 µm (a–d).

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