CD antigens mean the cell surface antigens of leukocytes. When lymphocytes mature, they express diverse protein receptors on the cell surface, and the protein receptors are useful in determining the type and maturation stage of the cells being examined. Some CD proteins do not play a role in cell signaling, but have other functions, such as cell adhesion.
Recombinant protein is a manipulated form of protein, which is generated in various ways to produce large quantities of proteins, modify gene sequences and manufacture useful commercial products. The formation of recombinant protein is carried out in specialized vehicles known as vectors. Recombinant technology is the process involved in the formation of recombinant protein.