Pan-African flag - History. 1  The flag was created in 1920 by members of UNIA in response to the enormously popular 1900 coon song Every Race Has a Flag but the Coon. [4] which has been cited as one of the three songs that firmly established the term coon in the American vocabulary.
A ligand is any molecule that binds to a specific site on a protein or other molecule. In this case, the estrogen hormone 17-beta-estradiol is the ligand, and the estrogen receptor is the protein. Binding turns on, or activates, a hormone receptor.
1 Once inside a target cell, the hormone (pink) binds to a receptor (purple) - similar to a hand sliding in a glove or mitten-and forms what is known as a hormone-receptor complex between the ligand and receptor. 2  A ligand is any molecule that binds to a specific site on a protein or other molecule.lick here to read about Steroid Hormone Receptors... When steroid and thyroid hormones bind with hormone receptors inside the cell, they trigger the gene expression that ultimately leads to protein production. But first, the hormones must get to the cell, enter it, and bind to a receptor to produce an effect.