Four-time world champion Yulia Efimova has had her provisional doping suspension lifted by swimming's governing body.
FINA says the move follows a recommendation from the World Anti-Doping Agency (WADA), which is conducting further scientific research on Meldonium.
Efimova said she tested positive for Meldonium earlier this year, but professed her innocence.
The endurance-boosting drug was banned on January 1.
WADA is researching whether a low concentration of Meldonium can indicate whether athletes did not take it after January 1
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FINA "clarifies that this case is not closed. Following the outcome of WADA's scientific studies and subsequent indication on this matter, the FINA Doping Panel will take a decision".
Efimova is considered Russia's top medal hope in swimming for the Rio Olympics.
