"110981933"@en-us . . "menstrual cycle"@en-us . . "115288111"^^ . . . . "0"^^ . "0"^^ . "a recurring cycle (beginning at menarche and ending at menopause) in which the endometrial lining of the uterus prepares for pregnancy; if pregnancy does not occur the lining is shed at menstruation; \"the average menstrual cycle is 28 days\""@en-us . . "114423094"@en-us . . . . "15288111-n"^^ . "menstrual cycle"^^ .