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Vitrified-warmed MII stage oocytes. Ultrastructure of multivesicular bodies (a) and lysosomes, sometimes associated with vacuoles (b). MVB multivesicular body, Ly lysosome, m mitochondria, MV mithocondria-vacuoles complexes, V vacuoles (modified from: [67] Nottola et al., 2009 (a) and [69] Bianchi et al., 2014 (b))
