Cris Cyborg Justino, considered one of if not the most dominant female mixed martial artists, was flagged for a potential anti-doping violation by the U.S. Anti-Doping Agency, the UFC said Thursday afternoon.

The potential violation stems from an out-of-competition sample collection on Dec. 5.

Justino’s long-time representative Ray Elbe released a statement on The Underground, a popular MMA forum.

“Not for a steroid, and she has a prescription as part of the post-fight therapy she’s been receiving due to the severe weight cut,” Elbe said. “This has been known for a few days, and Cris’ doctor has been in direct contact with USADA turning over all the necessary patient files to document the reasons Cris needs the medication.”

Elbe said Justino had been prescribed spironolactone.

She has been tested 11 times in 2016, according to the USADA website. Only nine other UFC fighters have been tested more this year, and four others also were tested 11 times.

Justino, a Brazilian featherweight who recently was naturalized as a U.S. citizen, last fought on Sept. 24, beating Lina Lansberg by second-round TKO at UFC Fight Night Brasilia.

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USADA administers the UFC’s anti-doping policy.

“It is important to note that, under the UFC Anti-Doping Policy, there is a full fair legal review process that is afforded to all athletes before any sanctions are imposed,” the UFC said in a statement.

The UFC recently announced its new women’s 145-pound featherweight division, widely believed to have been done in order to showcase Cyborg, a dominant fighter who has documented her struggles to get down to 140 pounds for a catchweight bout in the UFC. Prior to adding the division, the UFC only featured 135-pound bantamweights and 115-pound strawweights in its women’s divisions.

Holly Holm and Germaine de Randamie will fight for the inaugural UFC women’s featherweight title at UFC 208 in Brooklyn. That news irked Cyborg and her followers.

Cyborg (17-1, 1 no contest, 2-0 UFC) hasn’t lost an MMA fight since her debut bout in 2005. She won the Strikeforce and Invicta featherweight titles.

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Cyborg tested positive for steroids once before — in early January 2012, shortly after she beat Hiroko Yamanaka in 16 seconds in a Strikeforce bout on Dec. 17, 2011. That test showed a positive result for stanozolol.