Grey Genome

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The Grey Genome is a genetic dna genome contained by all members of the Grey family in Marvel Comics X-men franchise. The gene is a mutant gene. The main carrier of the genome was Dr. John Grey, the father of Jean Grey, and Sara Grey. The genome was nearly eradicated due to the slaughter of all the Grey bloodline, however the gene survives in Nathan Summers, and Rachel Summers, both grandchildren of the late John.