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What is In ovarian cycle increaed levels of LH are due to and explain in detail?
Luteinising Hormone 

LH is a water-soluble glycoprotein of high molecular weight secreted by beta cells of the anterior pituitary gland
LH surge initiated by estrogen lasts for 48 h. LH level doubles up in 2 hrs and peak plateaus for 14 hours before declining.
Minimum of 75 ng/ml is required for ovulation