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(A) Digital model of a chimpanzee lower molar showing the presence of a cusp 6 (C6) at the outer enamel surface (left) and EDJ (right). (b) Schematic representation of the hypothetical relationship between the developing dentine horns (black peaks) of the hypoconulid (Hypd) and entoconid (En), the zones of inhibition of secondary enamel knots (red circles) and the variable presence of a C6.
