@nanu, sorry to bother you, but ogre doesn't want to work well with displacement maps It just makes the bright light pattern you can see in the picture.
I tried to add some dots, but it didn't help. Could you try making a "flat" nucleus model, please?
Sorry again for the trouble. The old model looked pretty awesome.
Edit: I just had an idea (which I think you proposed a while ago). Could you just create a flat circle and add the texture from your sphere onto it? It doesn't even have to be a circle, you could use a single quad and I could do alpha mapping. Just make sure you unwrap correctly But yeah, I think that could work very well—a circle mesh plus your cool nucleus model rendered to a texture from above.
Edit 2: Ooor... if you're feeling really adventurous, you could draw up something like this or this as the texture for the nucleus for a really cell-like feel, but that's up to you. I'm fine with both options, your model would look fantastic in-game as is.