The alpha-granular protein,GMP-140 ELISA Kit is a α- or alpha protein sometimes glycoprotein present in blood.Associated membrane protein types are lipopolysaccharide selective barriers. Biological membranes include cell membranes, outer coverings of cells or organelles that allow passage of certain proteins and nuclear membranes, which cover a cell nucleus; and tissue membranes, such as mucosae and serosae.