A protein complex found on these cells is partly stabilized by beta-adducin and dematin. In these cells, a duo of membrane proteins assemble into antiparallel heterodimers that organize into a lattice network. These cells fail to rebound from elongation in hereditary ellipto·cytosis. The plasma membrane of these cells is supported by band 4.1 and ankyrin protein complexes tethered to spectrin filaments. These cells, which mature from (*) reticulocytes, (10[1])can be classified based on whether they express surface antigens terminated by GalNAc (10[1])(“gal-nack”) or galactose. A tetrameric protein found primarily in these cells in fetuses is composed of alpha and gamma chains. Some of these cells express the Rh (-5[1])factor. For 10 points, name these biconcave cells that can be classified using the ABO system. ■END■ (10[1])