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From SNPedia

User:Watson said this and appears to be talking about his CYP2D6*10 however it says CYP2P6. Notice the P vs D. what is going on here?

I am homozygous for the ‘10’ variant of the cytochrome P450 drug metabolizing gene, CYP2D6. As a result, I metabolize beta-blockers much more slowly than most other Caucasians, who largely carry the more efficient metabolizing 1A/1A genotype. Before I had this knowledge, my use of beta-blockers to control my blood pressure caused me to constantly fall asleep at inappropriate moments. Instead of a daily pill, I now take one every week. -- James Watson source