Anquan Boldin

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Colin Kaepernick spent 10 weeks of his offseason working on refining his mechanics and honing his understanding of the game with, among others, two-time MVP quarterback Kurt Warner.

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Editor's note: Stay logged on to CSNBayArea.com all week as 49ers Insider Matt Maiocco will bring you comprehensive coverage from the NFL owners meetings in Arizona.

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Wide receiver Michael Crabtree, who spent his first six NFL seasons with the 49ers, made a free-agent visit to the Miami Dolphins on Thursday, the team announced.

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SANTA CLARA -- Anquan Boldin, Michael Crabtree and Stevie Johnson, the 49ers’ top three wide receivers last season, are all similar in style.

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Colin Kaepernick, Anquan Boldin and Torrey Smith will play pivotal roles for the 2015 49ers offense.

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