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.
Jewish Holidays 2015-2016. Dates of major and minor Jewish holidays for Hebrew Year 5776. Each holiday page includes a brief overview of special observances and customs, and any special Torah readings. All holidays begin at sundown on the evening before the date specified in the tables below. For example, if the dates for Rosh Hashana were listed as Sep 14-15, then the holiday begins at sundown on Sep 13 and ends at nightfall on Sep 15.