37That said, it should be borne in mind that the Court has repeatedly held that it is clear from Article 4(1) of Directive 2000/78 that it is not the ground on which the difference of treatment is based but a characteristic related to that ground which must constitute a genuine and determining occupational requirement (see judgments of 12 January 2010, Wolf, C‑229/08, EU:C:2010:3, paragraph 35; of 13 September 2011, Prigge and Others, C‑447/09, EU:C:2011:573, paragraph 66; of 13 November 2014, Vital Pérez, C‑416/13, EU:C:2014:2371, paragraph 36; and of 15 November 2016, Salaberria Sorondo, C‑258/15, EU:C:2016:873, paragraph 33).
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