Hair particle is not visible


I have made with the particle system hair for my character. I was happy with the result. But now strange enough 1 part is gone. in a test rendering I only saw half my hair. I tried something but now I don’t see anything anymore in the viewport. I put quite a lot of time in this, I hope don’t have to start over.
I am a blender beginner.

thank you for your help!!

I am sorry. I think they are gone. I could not find them. It’s only to top part you have to do again.

But i can also not tell you how it happens because normally they are quite robust and don’t disappear suddenly… The hair system in blender is quite popular under professionals.

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Perhaps you have a BKP file in your auto save folder… with it.