San Francisco 49ers rookie wide receiver Dante Pettis got a lot of work in the slot during Tuesday's practice. The team kicked off its organized team activities this week, and Tuesday's practice session was one of three over the course of the next few weeks that will be open to the media.

Pettis received a significant amount of the reps because last year's starter at the position, Trent Taylor, is dealing with a back injury, according to head coach Kyle Shanahan.

"His back's bothering him," Shanahan said. "He went a little bit yesterday, and he just wasn't looking right, so we pulled him out. We didn't let him go today. It will be week-to-week."

The 49ers made Taylor a fifth-round draft pick out of Louisiana Tech last year. During his rookie season, he registered 43 receptions for 430 yards with two touchdowns.