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. 2015 May 13;10(5):e0124980. doi: 10.1371/journal.pone.0124980

Fig 5. The Age Reference Line (ARL) ranking, showing the molar progression stage associated with data from previous ageing studies [3, 10].

Fig 5

Plateaus can be seen in the graph because some lamellae move through more quickly than others, particularly the smaller ones at each end of molars, and some lamellae may not pass the ARL in occlusal wear (eg M6L1).