A senior scientist who said physics "was invented and built by men" has been suspended with immediate effect from working with the European nuclear research centre Cern.
Prof Alessandro Strumia, of Pisa University, made the comments during a presentation organised by the group.
He said, in comments first reported by the BBC's Pallab Ghosh, that physics was "becoming sexist against men".
Cern said on Monday it was suspending Prof Strumia pending an investigation.
It stated that his presentation was "unacceptable".
"Cern always strives to carry out its scientific mission in a peaceful and inclusive environment," the statement reads, calling the presentation "contrary to the Cern Code of Conduct".
The organisation said it was "unfortunate" the views of the scientist, who works at a collaborating university, "risks overshadowing the important message and achievements of the event".
