Clue: Blood type determinant

Answer: GENE

Length: 4

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Similar Clues:

• All of the blood type letters (ABO with 3 letters)
• Fairly uncommon blood type, informally (ONEG with 4 letters)
• Blood-type letters (ABO with 3 letters)
• Rare blood type (ANEGATIVE with 9 letters)
• Like the blood type of "universal donors" (RHNEGATIVE with 10 letters)
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• Universal donor's blood type, briefly (ONEG with 4 letters)
• Blood type historically considered the universal donor (ONEGATIVE with 9 letters)
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