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.
In February 1991, the Schomburg Center for Research in Black Culture in Harlem observed the 89th birthday of the poet Langston Hughes and the beginning of Black History Month. Mr. Hughesâs ashes are buried beneath the floor of the auditorium, and in an African Custom of ancestral return, the writers Amiri Baraka and Maya Angelou danced atop them.