Thyroid hormones (T 4 and T 3) are produced by the follicular cells of the thyroid gland and are regulated by TSH made by the thyrotropes of the anterior pituitary gland. The effects of T 4 in vivo are mediated via T 3 (T 4 is converted to T 3 in target tissues). T 3 is 3- to 5- fold more active than T 4.
May is Jewish American Heritage Month The Library of Congress, National Archives and Records Administration, National Endowment for the Humanities, National Gallery of Art, National Park Service and United States Holocaust Memorial Museum join in paying tribute to the generations of Jewish Americans who have helped form the fabric of American history, culture and society.
Updated February 16, 2017. Hanukkah (sometimes transliterated Chanukkah) is a Jewish holiday celebrated for eight days and nights. It starts on the 25th of the Jewish month of Kislev, which coincides with late November-late December on the secular calendar. In Hebrew, the word hanukkah means dedication..