CD antigens related to signal transduction

Signal transduction is the process by which a cell recognizes changes in its environment and transforms that signal into modifications in cellular activity and gene expression. Cells receive information through a class of proteins known as receptors. Some CD antigens are cells surface proteins as receptors. The CD antigens interaction are fundamental to cell signaling. When such CD antigen activate its receptor, the signal is carried into the cell usually by means of a second messenger.