CYP19A1 and polycystic ovary syndrome: Rodent models of PCOS can be attained by a variety of methods, including constant exposure to light [20], genetic manipulation [17], and administration of hormones, such as testosterone (T) [17], dihydrotestosterone (DHT) [21], EV [22, 23], and letrozole (a non-steroidal aromatase inhibitor) [21, 24].