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Twelve-year-old sisters Cayetana and Celia share the same genetic mutation, but only one of them suffers from an extremely rare disease that turns muscle into bony plaques

Santiago de compostelaUnited statesFederico martinSara pischeddaDavid liuEduardo agrasoAntonio salasFred kaplanHarvard universityUniversity of pennsylvaniaUniversity clinical hospital of santiago de compostelaGalician association of progressive osseous heteroplasiaUniversity clinical hospitalGalician associationProgressive osseous