SOLVED. Science Fiction book where the protagonist learns the ability to control the cells in his body, and thereby reshape his body. [s]

[Tab]

How many years ago did you read this?
Anything about the cover?
Part of a series?

[caracal-eyes]

Probably not, but: Wit'ch Fire

[Daphne]

This is Threshold by David R. Palmer. There were no sequels because this book did not get a good critical reception.

[Daphne]

Yes, I read it. I was a big fan of Emergence so I looked for Threshold for a long time. I didn't like it so well, but it was instantly recognizable from your description.