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| an early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. |
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| The area between a woman's breast; the total or partial division of the egg into to smaller cells or blastomeres. |
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| the attachment ad embedding of the fertilized ovum in the endometrium. |
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| The union of a male and female gametes to form a zygote, a process that begins with penetration of the secondary oocyte by the spermatozoa and is completed by the fusion of the male and female pronuclei. |
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| a chemical substance produced in the body which has a specific regulatory effect on the activity of certain cells and organs. |
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| The discharge of the ovum from the graafan follicle. |
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| The cyclic, physiological discharge through the vagina of blood and mucosal tissues from the non-pregnant uterus; it is under hormonal control and normally occurs approximately in four-week intervals, with the exception of pregnancy ad lactation throughout the reproductive period. |
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