CYP19A1 and polycystic ovary syndrome: Some of the common methods for inducing PCOS in rats include constant light exposure, hypothalamic lesions, administration of testosterone propionate (TP), testosterone (T), dehydroepiandrosterone (DHEA), androstenedione, dihydrotestosterone (DHT), administration of estrogen in early postnatal life and anti-progesterone and aromatase inhibitor letrozole [22,23].