Why are there no mutants in Logan?

Why are there no mutants in Logan? Zander Rice (Richard E. Grant) concocted a formula that would suppress the mutant gene. Unfortunately, his formula—present in the genetically-altered corn syrup his company was mass manufacturing—nearly wiped out the mutants instead.

Zander Rice (Richard E. Grant) concocted a formula that would suppress the mutant gene. Unfortunately, his formula—present in the genetically-altered corn syrup his company was mass manufacturing—nearly wiped out the mutants instead.
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