SANTA CLARA, Calif. -- In high school or while at Mississippi State, the last thing Anthony Dixon thought about was what do fullbacks do?Fullback?Dixon was a tailback, baby. A star running back. All he knew was the fullback was in front of him to help him eat yards."I don't know anything about lead blocking," said Dixon, who was a 1,400-plus yard rusher his senior season in college.However, the NFL often changes a player's priorities. It is an adjust-or-go-find-another-line-of-work business.