Fig 2.

The cell surface receptor repertoire of the human erythrocyte. A schematic structural representation of the human erythrocyte cell surface receptor repertoire drawn approximately to scale together with the receptor abundances, where known, shown as bars on the scale. The figure contrasts large receptors such as CR1, which project 85 nm away from the membrane, but, at 1000 copies per cell, are relatively rare whereas the much smaller glycophorins are vastly more abundant, containing up to a million copies per cell in the case of GYPA.