In the ovary, Estrogens from granulosa cells are secreted into follicular fluid: [Estrogen] is very high in ovarian follicular fluid Steroid Egg highly specialized A possible function is maternal mRNA production in the maturing oocyte.
Flagstaff. 1  See the Museum of Northern Arizona in Flagstaff. 2  Ski Arizona Snowbowl (or in summer go to the top of Mt. Humphries on a ski lift) 3  See the Indian Ruins at Walnut Canyon near Flagstaff.  Lowell Observatory in 1  Flagstaff. Explore the past at Walnut Canyon National Monument.  Camp or hike at the Flagstaff Nordic Center.
Getting There. Las Vegas and Phoenix are the closest major cities to the North and South rims, respectively. You can save money by flying into these cities, but they're too far from the canyon to stay. Flagstaff, Williams, and Tusayan (all in Arizona) and Kanab (in Utah) are better choices for lodging near the Grand Canyon. By Plane.