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Levels of latent matrix metallopeptidase-9 (proMMP9) per cumulus-oocyte complex (COC) at 24 h of in vitro maturation (hIVM) after supplementing with human proMMP9 (hMMP9) at 18 hIVM. Cumulus-oocyte complexes were matured at 38.5 or 41.0ºC (first 12 h only and then transferred to 38.5ºC). ABC Denotes means differ.
