In the Mitchell Report McNamee said he injected Pettite with human growth hormone, now banned in baseball, and Pettite has acknowledged it.

NPR: Clemens, Trainer Stick to Conflicting Stories

McNamee says he injected Clemens with steroids and human growth hormone on Clemens' orders.

NPR: Before Congress, Clemens Insists He Is Innocent

Wednesday morning, he'll be ushered into a congressional hearing room to answer questions from a congressional committee on allegations he boosted his pitching career with steroids and human growth hormone (HGH).

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