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. Author manuscript; available in PMC: 2020 Jul 14.
Published in final edited form as: Nature. 2019 Jul 15;572(7767):112–115. doi: 10.1038/s41586-019-1370-5

FIG. 1: Breastfeeding period of A. africanus:

FIG. 1:

(A) section of enamel lower canine of StS 51 and associated 138Ba/43Ca elemental mapping. (B) section of enamel upper first molar of StS 28 and associated 138Ba/43Ca elemental mapping. The dotted lines indicate the beginning of enamel calcification, the time at which the breastfeeding peaked and the date at which the infant A. africanus breast milk intake decreased in profit to solid food. A period of approximately ~12 months and ~13 months for StS 51 and StS 28 of predominant breastfeeding was estimated using the distance between the identified lines and the average rate of calcification of the species (5.5 μm/d)16,17,18