Ms Semenya's lawyers say the plan is discriminatory.
The landmark case is expected to challenge science and gender politics.
Semenya takes landmark hormone challenge to sports court
Caster Semenya after winning the Women's 800m Final at the 2018 Commonwealth Games Source: AAP
Switzerland's Court of Arbitration for Sport is hearing a challenge by champion South African runner, Caster Semenya, to plans forcing female runners with genetically high levels of male sex hormones to lower them.
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