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| Description: Hormones traveling throughout the body will only affect target cells that possess specific protein receptors. Receptors are continually being synthesized and broken down. Receptors may be down-regulated in the presence of high concentrations of hormone. Receptors may be up-regulated in the presence of low concentrations of hormone. Picture Stats: Views: 866 Filesize: 603.52kB Height: 900 Width: 1214 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40275 |