Cover design The front cover of Molecular Human Reproduction shows dual staining for mast cell tryptase (red) and matrix metalloproteinase-1 (MMP-1) (green) in the human uterus (dual staining is depicted as yellow). The presence of MMP in mast cells and increased mast cells in cases of breakthrough bleeding suggests a role for the mast cells in this process. For further details, please see 559-565.
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