SANTA CLARA, Calif. (AP) Now that he has taken over the unofficial role as the San Francisco 49ers' No. 1 wide receiver, rookie Michael Crabtree is searching for missing elements in his game.

The team's first-round draft pick has had a rather smooth and productive transition into San Francisco's starting lineup since joining the 49ers in early October. But after his first month of NFL action, Crabtree says there's one thing that has been lacking in his repertoire.

"YAC," Crabtree said Thursday. "That's what I was really big on in college, and in football period. I just want to get that YAC." (MORE)