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A reproductive cell, sometimes also called an egg. Ova (plural) are stored in the ovaries and released into the fallopian tubes during ovulation, and can then be fertilized by sperm cells which can result in pregnancy.

The onset of pregnancy, marked by implantation of the blastocyst into the endometrium (the lining of the uterus).

A bacterial infection/STI, transmitted when someone touches a sore on a person who has syphilis. These sores are can be on the mouth, penis, vagina, anus or skin. It requires medical treatment.