Halton is missing practice during 49ers training camp due to a bone bruise on his knee, Nick Wagoner of ESPN.com reports.
It's not the ideal start to Halton's pro career after he was drafted in the fourth round back in April. He'll have some catching up to do when he's back to full strength, and in his absence, rookie undrafted free agent James Thompson could see more focus as a depth option on the defensive line.