apparently none; former cybernetic enhancements augmented his strength, reflexes, and durability, extended his arms and fingernails into razor sharp weapons, and regenerated him through techno-organic growth
Donald Pierce was apparently killed by Logan in Weapon X (1st series) #4. He has since reappeared as the seemingly unaltered human Goodnight in Point One #1 as a member of the X-Terminated, with no explanation yet.
All appearances in chronological order :
Weapon X (1st series) #2-4