INTRODUCTION NORMAL ERYTHROCYTE MEMBRANES Composition of erythrocyte membranes Stereotactic structure of erythrocyte membranes Skeletal proteins Integral proteins Anchor proteins Morphogenesis Erythrocyte membrane protein genes Blood type antigens DISEASE STATES OF ERYTHROCYTE MEMBRANES: THEIR GENOTYPES AND PHENOTYPES Erythrocyte membrane disorders based on their shape changes Abnormalities of skeletal proteins Abnormalities of integral proteins and blood type antigens Abnormalities of anchoring proteins Abnormalities of membrane lipids CLOSING REMARKS