FLUORESCENT PROTEIN/IMMUNE SYSTEM, GFP, GFP-NANOBODY, BETA-BARREL, ANTIBODY, LUMINESCENT PROTEIN-IMMUNE SYSTEM COMPLEX, FLUORESCENT PROTEIN-IMMUNE SYSTEM COMPLEX STRUCTURE OF THE GFP:GFP-NANOBODY COMPLEX AT 2.8 A RESOLUTION IN SPACEGROUP P21212 3OGO