New Jersey residents who want to start a dancing class with strict gender restrictions will be able to do so starting Friday.

The state Board of Education has given final approval to a new regulation that will require the school districts to allow only students of the gender listed on their birth certificates.

It’s a big win for the ballroom dancer community, which has long fought for more flexibility for the dance and has often been frustrated by the lack of diversity among dancers in the state.

But it comes at a cost.

The new regulation has already led to lawsuits and the state’s largest dance troupe has announced it is canceling its 2018 season.

New Jersey’s dance instructors have been the target of death threats.

One woman was beaten by her boyfriend.

And this year’s class was disrupted by a threat to the teacher who was supposed to supervise it.

The new regulation will go into effect immediately.

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