結果 : o negative blood group is rare or not
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Comparison: BLOOD Group

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Scientists discover new group of blood types

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"The Truth About Blood Group A Negative: Rare Traits and Health Implications" - NYC

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Why is O-negative blood so important?

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The Blood Type O Diet Guide

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There Are Millions of Blood Types

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Is Your DNA Alien? Yes, If You Have This Rare Blood Group!

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