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The ovarian and uterine cycles in a human female.
The ovarian cycle is divided into the follicular and luteal phases, while the uterine cycle is divided into menstruation and the proliferative and secretory phases.
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Karenia brevis
Colorized micrograph of Karenia brevis, a dinoflagellate that makes a nerve toxin.
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Structure of a woody stem
The rings visible in the heartwood and sapwood are regions of early and late wood. In most temperate zone trees, one ring forms each year.
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Hypersensitive Response
Evidence of a hypersensitive response in a leaf Brown spots are dead tissue where germinating fungi pen-etrated the leaf s epidermis triggering a release of hydrogen peroxide and nitric oxide ...
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