Smears from fingerstick collected blood (propositus). Upper panel: low power magnification, 3 “sugar cane” crystals are observed in one field. Middle and lower panels: full arrows point to intraerythrocytic tetragonal crystals. In the middle panel, the crystal is contained within a red cell membrane (open arrows) and all its Hb content has been included in the crystal. The lower panel shows the crystal without the red cell membrane.