Perhaps the most noteworthy absence was rookie first-round pick Mykel Williams.

The San Francisco 49ers have a deep pool of wide receivers trying to earn a roster spot after being given an opportunity to compete at training camp.

The San Francisco 49ers held their breath toward the end of practice on Sunday when defensive lineman Tarron Jackson collapsed on the field, according to NBC Sports Bay Area. Jackson was taken off the field on a stretcher and transported to the hospital for further evaluation.

San Francisco 49ers defensive lineman Tarron Jackson was taken to the hospital after a scary injury at training camp practice but had all feeling in his extremities.