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Moira did eventually find a cure for the disease, when the terrorist Mystique manipulated her research to force the virus to target only humans.

Mystique, partly assisted by Sabretooth, then destroyed Muir Island, de-powered Wolfsbane, and brutally injured Moira.

Bishop, Wolverine, and Rogue attempted to save Moira's life.

Despite Rogue's powers temporarily granting her medical knowledge, she was unable to do so.

She clung to life long enough to mentally transfer the information to Xavier in one final embrace between the former lovers.

She died in the X-Men's jet, far above the Atlantic Ocean, and was later buried in Scotland.