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Dear Dr. Vinny,

How are Cabernet Sauvignon, Cabernet Franc and Sauvignon Blanc related, if at all?

—Janet H., Palo Alto, Calif.

Dear Janet,

Even though it’s often called the “king” of red wine grapes, Cabernet Sauvignon is a happy accident. About 15 years ago, DNA testing showed that Cabernet Sauvignon is actually a cross between Cabernet Franc and Sauvignon Blanc. Since vine breeding wasn’t well understood at the time Cabernet Sauvignon first showed up, in the 17th century, we might assume its creation was not planned. Long live the king!

—Dr. Vinny

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