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String of genes that virtually do nothing in common situation, X-factor is preset in every woman post Mitochondrial eve BUT as scattered parts than modular like Ichika is, hence X, as in X chromosome. Later, Ichika's is renamed Y-unit because of it's unique nature.
It's a handwave on my part of course, but anyone with Y-unit could, theoretically, use I.S. to some extent.
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