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Expression of SUMO-1 and SUMO-2/3 modified proteins during mouse oocyte maturation. Samples were collected after oocyte culture for 0, 4, 8, 9.5 and 12 h, corresponding to the GV, prometaphase I, metaphase I, anaphase I, metaphase II stages, respectively. Proteins from a total of 250 oocytes were loaded for each sample. Experiments were repeated three times.
